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Education, Training & More Product Information

Training leads to productivity!

Coherent offers training courses in our Laser Training Center or at your site. Training can help to maintain optimum laser performance, increase the life of your laser, and improve your product quality. In addition, we offer custom courses tailored to your specific requirements – preventative maintenance, process optimization, application development, and much more.

We offer:

  • Customer basis training to ensure the best operation of your laser
  • Customer advanced training to ensure the highest productivity of your system
  • Customized training adapted to your needs

Participants who successfully complete a laser training course will gain a level of knowledge and skill that will allow them to effectively and efficiently operate, optimize, and maintain their laser system.

The customer must have purchased and received a Coherent laser system before attending a training course.

Instructors:

Our instructors have extensive knowledge and experience in their areas of product specialty. They have gained their expertise through formal education and by working in various fields, such as manufacturing, customer service and engineering. Each instructor creates a professional and comfortable environment that is ideal for learning. All courses include both lecture and lab time with the emphasis on hands-on learning and individualized attention. Class sizes are small, ensuring a generous amount of personal attention.

Coherent Course Catalog:

To explore exactly what Coherent offers, download the latest version of the Coherent Laser Training Catalog of Courses below. In this booklet you will find complete course descriptions, key topics covered, and a list of prerequisites for each course. Additionally, you will find the information you will need to begin the registration process. There are some courses available that don’t appear on the training schedule. Coherent can also customize special courses to meet your specific training needs.

Training Locations

Coherent, Inc. - Santa Clara Laser Training Facility

5100 Patrick Henry Drive

Santa Clara, CA 95051

Coherent GmbH. - Excimer Laser Training Facility

Hans-Boeckler-Strasse 12, Werk 1

D-37079 Gottingen, Germany

________________________________________________________________________________


Coherent Laser Training Catalog of Courses

Laser Eyewear Suppliers

Travel Guide Coherent Goettingen

Visitor Guide Coherent Goettingen

Santa Clara Travel Information and Visitors Guide

PZT Out of Range

For Vitesse Lasers

Verify the baseplate is 25 ± 1ºCelcius.

In order to achieve optimum alignment of the Verdi pump beam into the ultrafast laser head, the baseplate temperature must be 25 ± 1ºC. If the temperature deviates appreciably from this value, the PZTs will compensate, but if the temperature is too far from 25ºC, the PZTs will reach the end of their range (0-5 Volts). Adjust the chiller temperature as necessary to ensure the baseplate temperature is correct. Normally a chiller reservoir temperature of approximately 20ºC results in a baseplate temperature of 25ºC.


Verify the Verdi pump laser is at the correct power to generate Vitesse power between the Q-Switch and CW-Breakthrough limits. If the Verdi pump power is too low, the response of the PZTs may be adversely affected.

  • Verify the Verdi laser is at the correct power.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Power Fluctuation

For Vitesse Lasers

Verify power instability with an external power meter.

To verify whether the instability is caused by the laser, or the photodiode electronics, use an external power meter or photodiode to examine the laser stability.

To verify whether the instability is caused by the laser, or the photodiode electronics, use an external power meter or photodiode to examine the laser stability.
Access the “Power Track” menu (a Vitesse Setting submenu) and verify that both the “Power Track setting” and “Power Track status” are ON. Access the “Automodelock” menu (a Vitesse Setting submenu) and verify that “Automodelock setting” is ON. Verify the system is modelocked, as indicated on line 2 of the top level menu.

  • Verify laser is reliably modelocked, and PowerTrack is operating. To determine whether the power instability originates with the Verdi pump laser or the ultrafast head, access the “Light Loop Control” menu and set the laser to “Verdi Light Loop Mode”. Re-evaluate the power stability.
  • Operate laser in Verdi light loop. All Vitesse models have a water-cooled baseplate that must be maintained at 25 ± 1ºCelsius. Excessive fluctuation of the baseplate temperature will affect the power stability. Verify the chiller temperature is set correctly, and the chiller water is circulating through the baseplate.
  • Stabilize head baseplate temperature. Access the “PZT Control” menu (a Vitesse Setting submenu). Verify the “PZT X” and “PZT Y” values are between 2 and 3 Volts (ideally). Ensure the “PZT mode” is AUTO. PZT values which fall in the ranges 1-2 Volts, or 3-4 Volts are acceptable, but PZT values which are < 1 Volt, or > 4 Volts indicate the ultrafast head is significantly misaligned, and the PZTs are at the extremes of their ranges, in order to compensate. If the PZTs are toward the extremes of their range (<1 Volt or >4 Volts), ensure the baseplate temperature is 25 ± 1ºCelsius. If the baseplate temperature is 25 ± 1ºCelsius, but the PZTs are at the extremes, the PZTs will need to be recentered. Contact Coherent Service or your authorized Coherent representative.
  • Verify PZTs are mid-range, approximately 2-3 Volts.

Access the “Peak Hold” menu (a Vitesse Setting submenu). Verify the “Peak Hold setting” is OFF.

  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Not Modelocking

For Vitesse Lasers

Verify the baseplate is 25 ± 1ºCelsius.

Verify the baseplate is 25 ± 1ºCelsius.
Access the “Vitesse Settings Menu”. View the “Automodelock” menu. Verify Automodelock is ON. View the “PowerTrack” menu. Verify the Powertrack setting is ON. Access the “Peak Hold” menu. Verify Peak Hold is OFF. Access the “PZT Control” menu. Verify the PZT mode is AUTO.

Optimum alignment of the Verdi pump beam into the ultrafast head can only be achieved if the baseplate temperature is 25 ± 1ºCelsius. Adjust the chiller temperature as necessary to ensure the baseplate temperature is correct.

  • Verify automodelock, powertracking, peak hold and PZT control are correctly set.
  • Verify the Verdi and Vitesse CW powers are adequate.

Consult the Data Sheet shipped with the laser to ensure the Vitesse laser is lasing at a CW power between the Q-Switching and CW Breakthrough limits. Adjust the Verdi pump power accordingly. If the Verdi power is low, consult the Verdi “Low Power” troubleshooting page. If the Verdi power is normal, but the Vitesse CW power is low, consult the Vitesse “Low Power” troubleshooting page. If both Verdi and Vitesse CW powers are normal, but the systems will not modelock, put the system in Standby, and attempt to restart the system. If the modelocking problem occurs repeatedly, despite adequate Vitesse CW power, contact Coherent Service or your authorized Coherent representative.

  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Low Power

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For Vitesse Lasers

Operate the laser in Verdi light loop, and verify Verdi laser is operating at full power.

Access the “Light Loop Control” menu, scroll the arrow to “Verdi Light Loop Mode” and press “Select” to put the system into Verdi light loop. Press EXIT. Access the “Power Adjustment” menu, and set the Verdi power to full power. If the Verdi cannot maintain full power, follow the Verdi troubleshooting steps for “Low Power”.


Access the “Display A/D Reading” menu (a Vitesse Status submenu). Examine the value of “ThermV”. ThermV is a voltage proportional to the Ti:sapphire crystal temperature, and should be between 2.5 and 3.0 Volts.

  • Verify the Ti:sapphire crystal is at the correct temperature.
  • Verify the PowerTrack PZTs are between 2 and 3 Volts.

The PowerTrack PZTs optimize the alignment of the Verdi beam into the ultrafast head. They have a range of 0-5 Volts and should ideally be between 2 and 3 Volts. Operate the laser at normal operating conditions, and access the “PZT Control” menu (a Vitesse Setting submenu). Examine the values of PZT X and PZT Y. If either of the PZT voltages is less than 1 Volt or greater than 4 Volts, the PZTs will need to be recentered. Contact Coherent Service or your authorized Coherent representative for further assistance.


Beam Quality

In general, there is very little that can be done to improve the mode of a solid state laser. The optics are permanently aligned, and cannot be adjusted. Mode problems occur rarely. When they do occur, they are often indicative of damage to an optic. Typically, the laser head must be returned to the factory to correct a mode problem. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For Vitesse Lasers

For Vitesse Lasers

  • Ensure the laser is running at within its limits. If necessary, follow the “Low Power” troubleshooting steps.
  • Ultrafast lasers must run between 2 well-defined power limits – the “Q-Switching” limit is the low power limit, and the “CW breakthrough” limit is the high power limit. The mode quality can only be guaranteed if the laser power is between these 2 limits. Consult the data sheet, which shipped with the laser to ensure the laser is operating between these 2 limits. Access the “Servo Status” menu (a “Verdi Status” submenu). Verify the vanadate and etalon temperatures are equal to the values noted on the Customer Data sheet (which was shipped with the laser).
  • Verify the vanadate, etalon, LBO and Ti:sapphire are at the correct setpoints.
  • Access the “LBO Settings” menu, and verify the setpoint temperature (“Set”) is equal to the actual temperature (“T”).
  • Access the “Display A/D Reading” menu (a Vitesse Status submenu). Examine the value of “ThermV”. ThermV is a voltage proportional to the Ti:sapphire crystal temperature, and should be between 2.5 and 3.0 Volts.

Beam Pointing Instability

For Vitesse Lasers

Stabilize head baseplate temperature.
Verify that the ambient temperature is not excessive, or abnormally unstable. If the head is water-cooled, verify the water flow and temperature setpoint are correct.

Run the laser at normal operating conditions, and record the head baseplate temperature hourly, over the course of a day, in order to determine the variation in the head baseplate temperature. Consider whether the variation in head baseplate temperature correlates with the variation in beam pointing. If the head baseplate temperature varies markedly throughout the day, water cooling of the baseplate is recommended.

All Vitesse models have a water-cooled baseplate that must be maintained at 25 ± 1ºCelsius.

  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Power Fluctuation

For Verdi Lasers

Verify power instability with an external power meter.

To verify whether the instability is caused by the laser, or the photodiode electronics, use an external power meter or photodiode to examine the laser stability.


Some customers, especially those using the Verdi laser for pumping ultrafast lasers, may be able to easily measure the characteristic frequency of the power fluctuation if the fluctuation is periodic in nature. This may assist with diagnosis of the problem. If the power fluctuation is sinusoidal in nature, with a frequency of 3 kHz, the likely cause is that the photocell gain is too high. Contact Coherent Service or your authorized Coherent representative for further assistance.

  • If possible, identify any characteristic frequency of the power fluctuation.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Over Current Fault

When the output power of Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults. Refer to the troubleshooting advice for “Low Power”.

Verdi “Low Power” troubleshooting steps

Vitesse “Low Power” troubleshooting steps

If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.


Not Single Frequency

For Verdi Lasers

Verify the laser is operating at power greater than 0.5 Watt.

When the laser is running at a power less than 0.5 Watt, it is operating close to the lasing threshold. Under these low power conditions, single frequency operation cannot be guaranteed. Ensure the laser is operating at a power greater than 0.5 Watt. If a lower power laser beam is required, operate the laser at a higher power, and use a series of beamsplitters to reduce the laser power.


The temperature at which the etalon delivers single frequency performance is determined in the factory. Refer to the Data Sheet, which shipped with the laser to verify that the etalon is at the correct temperature. The etalon temperature may be viewed in the “Temperature Set Points” menu

  • Verify the etalon temperature is correct.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Low Power

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For Verdi Lasers

Verify the vanadate, etalon, Diodes, and LBO are at the correct operating temperatures.

The temperatures at which the vanadate, etalon, Diodes and LBO crystals perform most efficiently are determined when the laser is built. These optimum operating temperatures are listed on the Customer Data Sheet, which was shipped with the laser. Refer to this document. Access the “Temperature Set Points” menu, and verify that the “Set Pt” (the set temperature) and the “Read T” (the actual temperature) are equal to the temperature noted on the Data Sheet. The LBO or Diode temperatures may be slightly different than the value noted on the Data sheet, if the LBO or Diode optimizations have been run.

  • Optimize the LBO temperature.

The LBO temperature may require periodic reoptimization. However, this is only recommended for 2 and 5 Watt systems. Do not run the LBO optimization program if the laser is an 8 or 10 Watt laser, as this may cause the laser performance to degrade, rather than improve. To run the LBO optimization, operate the laser at full power, or at the highest operable power. The optimization program will not run unless the laser is operating at > 80% of full power. Access the “LBO Optimization” menu, and press “Select” to initiate the optimization. The optimization will require approximately 45 minutes, and will display a message when complete.

  • Evaluate the FAP power, by looking at the “Diode Parameters” menu.

Operate the laser at the highest power possible. Access the “Diode Parameters” menu. Examine the values for “Diode 1 Photocell” and “Diode 2 Photocell”. If the FAP modules are operating at full power, the photocell voltages should be close to 2.5 Volts. If either of these voltages is significantly higher or lower than 2.5 Volts, this may indicate a FAP failure. Contact Coherent Service, or your authorized representative for further troubleshooting assistance.


Beam Quality

In general, there is very little that can be done to improve the mode of a solid state laser. The optics are permanently aligned, and cannot be adjusted. Mode problems occur rarely. When they do occur, they are often indicative of damage to an optic. Typically, the laser head must be returned to the factory to correct a mode problem. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For Verdi Lasers

  • Ensure the laser is running at full power. If necessary, follow the “Low Power” troubleshooting steps.
  • At powers less than 0.5 Watt, the laser may be too close to the lasing threshold to meet mode specifications. If it is desired to run the laser at low power, the recommended method is to run the laser at a power of at least 1 Watt, and use a series of external beamsplitters to reduce the laser beam power. The temperatures at which the vanadate, etalon and LBO crystals perform most efficiently are determined when the laser is built. These optimum operating temperatures are listed on the Customer Data Sheet, which was shipped with the laser. Refer to this document. Access the “Temperature Set Points” menu, and verify that the “Set Pt” (the set temperature) and the “Read T” (the actual temperature) are equal to the temperature noted on the Data Sheet. The LBO temperature may be slightly different than the value noted on the Data sheet, if the LBO optimization program has been run. Verify the LBO “Read T” value is equal to the LBO “Set Pt” value.
  • Verify the vanadate, etalon and LBO temperatures are at the correct setpoints.

Beam Pointing Instability

For Verdi Lasers

  • Stabilize head baseplate temperature. Verify that the ambient temperature is not excessive, or abnormally unstable. If the head is water-cooled, verify the water flow and temperature setpoint are correct.

Run the laser at normal operating conditions, and record the head baseplate temperature hourly, over the course of a day, in order to determine the variation in the head baseplate temperature. Consider whether the variation in head baseplate temperature correlates with the variation in beam pointing. If the head baseplate temperature varies markedly throughout the day, water cooling of the baseplate is recommended.

Water-cooling of the head is required only for V10 and V18 lasers, but pointing stability will be markedly enhanced for all powers of Verdi lasers, if the head is water-cooled. If the Verdi laser is used in an application where pointing stability is a major concern, the head should be water-cooled. Contact Coherent Service or your authorized Coherent representative for further details.

  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Shutter Mismatch Fault

For AVIA, Verdi and Vitesse lasers –

  • Clear the fault. Retry the shutter. If fault occurs repeatedly, schedule a service call to replace the shutter assembly.

Shutter mismatch faults occur when the system CPU indicates the shutter is in one particular state (either open or closed) but the shutter sensor indicates the shutter is in the opposite state. If this fault occurs repeatedly, the cause may be either a mechanical failure of the shutter, or an electrical failure of the sensor. Contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.


Power Fluctuation

For AVIA Lasers

Operate laser with Internal triggering.

Any instability in the external triggering circuitry, such as missing triggers, may appear as a power fluctuation. Disconnect the cable, which delivers the external trigger signals, and operate the laser with internal triggering. Re-evaluate the power stability. Examine the external trigger signals on an oscilloscope to verify they are of the correct voltage and the intended repetition rate.

  • Verify power instability with an external power meter.

If possible, use a fast photodiode and oscilloscope to examine the power stability. One recommended photodiode is the Electro-Optics Technology model #ET-2020, with <1.5 nanoseconds rise time. This is a biased silicon photodetector. Refer to the website at: http://www.eotech.com.

  • If the laser is being operated in “Bursts” (on for several seconds then off for several seconds to several minutes) then the power stability can be improved by using the ThermEQ feature. Scroll to the “Pulse Delete/ThermEQ Adjust” menu and press select. Scroll the arrow down to the bottom line of the menu and press Select until the line reads “ThermEQ: On” and then press exit and test the operation of the laser.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

No Pulsing

For AVIA Lasers

Verify the external enable signal is supplied.

Verify an external enable signal is being supplied. This can be done in 3 ways – a shorting BNC can be connected to the external enable BNC connection on the rear panel of the power supply, a user-supplied external enable signal can be input at the external enable BNC, or , a user-supplied external enable signal can be input at the 25-pin D-connector on the rear panel of the power supply – contact the Operator’s manual for details and pinouts.


If the laser is being triggered with an external trigger, verify that the external trigger is being supplied, and is of adequate voltage and current. Refer to the Operator’s manual for details.

  • Verify external trigger signal is present. Operate the laser in Internal trigger (with the shorting BNC connected to the External Enable connector on the rear panel of the power supply) to determine whether the fault originates with the external trigger input. If the laser operates in Internal trigger mode, but not external mode, verify the external trigger inputs (trigger and external enable) are correctly provided.
  • Attempt to operate the laser using Continuous Mode, Internal trigger.

If the laser does not operate in Internal trigger mode, verify the diodes and pulsing are turned ON. Access the “Pulse Delete Adjust/ThermEQ Adjust” menu. Set Pulse Delete/ThermEQ OFF. Check for milliWatt-level CW laser output. (Refer to the next troubleshooting step for further details.) If CW emission is present when the diodes and pulsing are turned on, the RF generator or Pulse board may be damaged. Contact Coherent Service or your authorized Coherent representative for further assistance.

  • Check for laser output.

Carefully measure the laser output with an external power meter. A malfunction of the photocells can cause the front panel display to report “No Pulsing” even though the laser is operating normally. Contact Coherent Service or your authorized Coherent representative to arrange servicing.

If the laser is, in fact, not pulsing, but rather, emitting a low energy (milliWatt) CW beam, access the “Pulse Delete Adjust/ThermEQ Adjust” menu. Set Pulse Delete/ ThermEQ OFF. If the laser is still emitting a low energy CW beam, the most likely cause is a failure of the RF generator or Pulse board. Contact Coherent Service or your authorized Coherent representative to arrange servicing.

  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Low Power

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Note: Therma Track is not available for AVIA Ultra systems.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For AVIA Lasers

Optimize ThermaTrack.

  • ThermaTrack is an end mirror of the laser cavity that translates in order to shorten or lengthen the laser cavity. In this way, the laser cavity dimension can be optimized to respond to thermal lensing of the laser rods. The degree of thermal lensing depends on the laser power and repetition rate. Therefore, any time the diode pump power or rep rate is changed, ThermaTrack should be reoptimized. To optimize ThermaTrack, operate the laser at the desired conditions. From the top-level menu, scroll the arrow to point to the fourth display line, which reads “ThermaTrack”, and press the front panel control knob to initiate the optimization. The ThermaTrack mirror will automatically move through its entire range, and settle at the position, which results in the highest laser power.
  • Optimize the SHG, THG, Diode 1 and Diode 2 temperatures.The temperatures at which the SHG, THG, Diode 1 and Diode 2 perform most efficiently are determined when the laser is built. However, these temperatures should be periodically re-optimized. To do so, operate the laser at normal operating conditions (power and repetition rate), ensure the ThermaTrack adjustment is optimized, and then access the “Temperature Optimization” menu. Scroll the arrow to “SHG Temperature” and press “Select”. Press “Select” again to initiate the temperature optimization, which will require approximately 5 minutes to complete. Repeat this procedure to optimize the THG, Diode 1 and Diode 2 temperatures.
    Repeat ThermaTrack Optimization.
  • Shift the THG crystal to a new spot.A burned or damaged area on the THG crystal will cause low power. To shift the THG crystal to a new spot, turn Pulsing OFF, and then access the “Crystal Shifter” menu. Turn the front panel knob to access the next unused crystal spot. Turn the diodes and pulsing ON and carefully examine the mode. If the power improves, remain at this new crystal spot. If there is no power improvement, return to the original THG crystal spot.
  • If the laser in question is running version 3.32 Power Supply software or above, it is possible to do a preliminary check on the output power of the pump diodes through the software. To check which software version the laser has, simply turn the key switch on the front panel to standby and press Exit until the top-level menu is displayed. If the Power Supply version is 3.32 or above, continue with this step. If not, go on to the next step. Scroll to the menu titled “Diode Parameters” and look at the values for Diode 1 Photocell and Diode 2 Photocell. If either of these values are significantly different than 2.50 Volts, it may indicate a pump diode failure. If so, please contact your Coherent Rep for Service and further troubleshooting.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance

Front Panel Failure

For AVIA, Verdi and Vitesse Lasers

  • Contact Coherent Service or your authorized Coherent representative to arrange for replacement of the front panel, or keyboard.If the front panel pushbuttons, control knob, keyswitch, or display malfunction, they cannot be repaired, and must be replaced by an authorized Coherent service representative. Contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance. If the laser cannot be controlled from the front panel due to a front panel malfunction, the laser can be fully controlled from a computer by establishing RS-232 communication between the laser and computer, and using the computer to issue the appropriate commands. This will enable full operation of the laser while waiting for the front panel to be replaced. Refer to the operator’s manual, Section titled External Computer Control, for complete details.
  • Use RS-232 commands to communicate with the laser, and bypass front panel.

Clogged Water Flow

Clogged Water Flow

For AVIA, Verdi and Vitesse Lasers

Deionized water is corrosive. Hard water contains dissolved minerals, which may eventually precipitate and clog small diameter fittings. Periodically replace the water in the chiller, to retard algae growth.

  • Ensure distilled water is used in the chiller. Do not use deionized water, or hard water. Consult the Neslab manual for instructions on cleaning the pump strainer.
  • If using a Neslab CFT-25 chiller, clean the strainer. Small diameter fittings, which have clogged with mineral deposits, may require replacement.
  • If necessary, replace clogged fittings. Circulate acetic acid solution only until the mineral deposits have dissolved. Remove the acetic acid solution from the chiller and baseplate, and thoroughly rinse the system with distilled water. Acetic acid is corrosive to metals, and must not be left in the system for an extended period of time.
  • If necessary, circulate vinegar (5% acetic acid solution) throughout the chiller and baseplate, to dissolve mineral deposits.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Beam Quality

In general, there is very little that can be done to improve the mode of a solid state laser. The optics are permanently aligned, and cannot be adjusted. Mode problems occur rarely. When they do occur, they are often indicative of damage to an optic. Typically, the laser head must be returned to the factory to correct a mode problem. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For AVIA Lasers

Ensure the laser is running at full power. If necessary, follow the “Low Power” troubleshooting steps.

At very low power, the laser may be too far outside its normal operating parameters to meet mode specifications. If the mode quality is acceptable at higher powers, but not at low powers, and a low power beam is required, the recommended method is to run the laser at higher power, and use a series of external beamsplitters to reduce the laser beam power.

  • Optimize ThermaTrack.

ThermaTrack is a moving mirror whose position can be adjusted to compensate for thermal lensing effects of the laser rods. The position of ThermaTrack must be reoptimized every time the diode pump power or repetition rate is adjusted. It can be optimized from the main Avia menu, by scrolling the arrow to “ThermaTrack” and pushing in the front panel control knob. This initiates an automatic optimization of the ThermaTrack mirror, which will result in optimum laser power and mode quality.

  • Optimize the temperatures of the SHG, THG and diodes. Verify the laser rods are at the correct setpoint temperature.

It is unlikely that reoptimizing the temperatures of the crystals and diodes will solve a serious mode problem. However, a minor mode problem may be alleviated by ensuring the crystals are operating at peak efficiency. To optimize the SHG, operate the laser at normal operating conditions (power and repetition rate), ensure the ThermaTrack adjustment is optimized, and then access the “Temperature Optimization” menu. Scroll the arrow to “SHG Temperature” and press “Select”. Press “Select” again to initiate the temperature optimization, which will require approximately 5 minutes to complete. Repeat this procedure to optimize the THG, Diode 1 and Diode 2 temperatures.

The laser rods setpoint temperature cannot be adjusted from the temperature they were set to in the factory, which is 25ºC. Access the Servo Status menu and verify the laser rods are locked at this temperature.

  • Shift the THG crystal to a new spot.

Any crystal in which UV light is generated, will eventually become damaged by the UV light. For this reason, the THG crystal in the Avia laser has at least 20 sites. Shift the THG crystal to a new spot, to determine whether a burn or defect on the existing site is causing the mode problem. To shift the crystal spot, turn the Pulsing off, access the “Crystal Shifter” menu, and turn the knob to access an unused crystal spot. Operate the laser at normal operating conditions, and carefully examine the mode to determine if the mode problem has been corrected. If the mode is not improved, shift the THG crystal back to the original spot.


Beam Pointing Instability

For AVIA Lasers

Stabilize head baseplate temperature.
Verify that the ambient temperature is not excessive, or abnormally unstable. If the head is water-cooled, verify the water flow and temperature setpoint are correct.
If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

  • Run the laser at normal operating conditions, and record the head baseplate temperature hourly, over the course of a day, in order to determine the variation in the head baseplate temperature. Consider whether the variation in head baseplate temperature correlates with the variation in beam pointing. If the head baseplate temperature varies markedly throughout the day, water cooling of the baseplate is recommended.
  • Perform all Temperature optimizations and Therma Track optimizations (for non0Ultra systems) as described in the operator’s manual.

Battery Requires Service

For Avia, Verdi and Vitesse Lasers

  • Allow time for the battery to recharge. The system tests the battery charge during the first few seconds after the system is powered on. Therefore, the only time the battery fault will be displayed is during system power-up. The warning “Battery Requires Service” indicates that the battery charge is low. The battery automatically recharges whenever the system is supplied with AC power. Leave the system powered on for at least 8 hours, to enable the battery to recharge. After this period, perform the complete shutdown procedure from the operator’s manual, and then turn the system on again. If the battery fault message is displayed again, schedule a service call to replace the battery. Recurring battery faults indicate the battery is no longer rechargeable. The battery charge can be queried by RS-232 communication. Refer to the Operator’s manual for complete information on establishing an RS-232 link between the laser and a computer. A fully charged battery has 12-13 Volts.
  • Determine the battery charge.

If the battery fault has been displayed, and it is necessary to remove AC power for more than a few seconds, be sure to run the LBO/SHG Cooldown program, before removing AC power. Refer to Operator’s Manual for instructions.

  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Single-Line High-Reflector and Prism Cleaning

On some systems, the high reflector (HR) is sealed to the tube and is not accessible. Do not attempt to extract and clean the optic.

Handle laser optics with care. A scratch, trace of dirt, or film will diminish the laser’s efficiency. Before cleaning optics be sure that your hands are clean and that a clean, cushioned work surface is available.

Optics and optic coatings can be easily chipped or scratched. To prevent damage when removing or replacing mirrors, always grasp the optic by the outer edge. Never touch the optical surfaces with bare skin, the hemostats, or materials other than lens tissue. Only fresh (dry) spectroscopic grade Methanol should be used to clean optics.

Cleaning Procedure

  1. Close the intracavity shutter and position an appropriate power meter detector head in front of the laser system. Reopen the shutter and verity that the detector head has been properly positioned. The power meter detector head should be positioned as close to the laser head output aperture as possible. Care should also be taken to assure that a beam dump captures all back reflections from the detector surface.
  2. Depress the “Tune” button on the laser system remote control. This will place the laser system in the fixed Current mode of operation and disable PowerTrack, if equipped. Using the HR horizontal and vertical tilt controls optimize the laser system output power.
  3. Record the power, and if possible, the transverse laser mode.
  4. Close the intracavity shutter, remove the knurled cap securing the single-line holder, and remove the mirror holder. Turn the small plate (over the prism) to one side to allow easy access to the prism.
  5. Inspect bothe surfaces of the prism for contamination. A bright flashlight, held a glancing angle of incidence with respect to the optical surfaces, can help to visualize contaminates.
  6. If required, clean the exposed angled surfaces with one continuous wipe beginning at the prism base using the Hemostat and Lens Tissue method. Spraying excess cleaning solvent on the high reflector while wiping the front surface of the prism is a common problem when cleaning the prism, resulting in a net decrease in system output power. To prevent this problem shake excess solvent from the lens tissue, especially if the HR does not require cleaning.
  7. Re-center the plate over the prism.
  8. Visually inspect the coated surface of the HR. If the high reflector requires attention, follow steps below.
    • To remove the optic, lift and move the spring clip to the side. Grasp the high reflector by its edge while removing it.
    • Clean the coated surface (indicated by the arrow drawn on the side of the optic) using the Drop and Drag method.
    • After cleaning, re-insert the HR with the arrow on the side of the optic pointing toward the holder.
    • Lift and move the spring clip back in place.

  9. Reinstall the single-line mirror holder into the laser system, open the intracavity shutter, and optimize the output power using the HR horizontal and vertical tilt controls. The observed power should be equal or greater than that previously measured. Do not adjust any other optics or controls until this is the case. If the previous power can not be achieved, follow the steps below.
    • Remove the single-line holder and verify that the HR optic is properly installed, and was not been damaged by the cleaning or removal/reinstallation process.
    • Verify that that fresh spectroscopic grade methanol is being utilized, and re-clean all optical surfaces that were previously cleaned. Note that over time methanol will absorb water from the air, and that this water will leave a film on an optical coating and/or surface.

  10. Once the laser system is optimized, re-press the Tune button. If equipped, verify that the PowerTrack LED is illuminated. If the order of the transverse mode was the cause for cleaning, verify that the mode is as expected and that the system aperture and regulation mode are properly set for your application.


Removed Optics Cleaning

The following outlines the proper procedure for cleaning optics that has been removed from the laser system. To prevent the inadvertent misalignment of the laser system optics should be installed cleaned in their mounts whenever possible.

Optic cleaning is not a required component of a regular laser system maintenance schedule. Optics should only be cleaned as a corrective action for marked power decrease or poor mode quality. Optics should not be cleaned unless signs of contamination are clearly visible on the optic surfaces. Unnecessary cleaning will only shorten the life span of the optical coating.

Optics and optic coatings can be easily chipped or scratched. Therefore, to prevent damage when removing or replacing mirrors, always grasp the optic by the outer edge. Never touch the optical surfaces with bare skin.

Handle laser optics with care. A scratch, trace of dirt, or film will diminish the laser’s efficiency. Always use finger cots, latex gloves, or the equivalent when handling optics, and use a clean, cushioned work surface.

Optics Inspection

  1. Remove optic from holder and place the optic on its edge on a clean piece of lens tissue. Do not allow the optic to rest on one of its polished surfaces. Allow enough time for the optic to cool down to room temperature.
  2. Once the optic has cooled, examine the optic at different light angles for signs of contamination or scratches. If required, clean the optic using the cleaning procedure outlined below. If any scratches or contamination cannot be removed, the optic must be replaced.
  3. If no scratches are visible, breathe on the optic. The surface should fog with no discoloration. If any discoloration appears the coating has been damaged and the optic must be replaced.

The Drop and Drag Method

  1. If applicable, place the laser system in Current control mode of operation. For Ion laser systems disengage PowerTrack if this option is available. Record the laser system output power, and output mode characteristics if applicable. Turn off the laser system, or block the pump laser beam if the optic to be cleaned is in an oscillator or amplifier.
  2. Place a drop of Methanol in the center of a lens tissue. Place the wet portion of the lens tissue on the optic surface and slowly drag it across the optic. The lens tissue and optic should be nearly dry before completing the drag. Note that the optic may need to be held in place during this process.
  3. Inspect the surface of the optic as outlined above. If streaks or contamination can be seen repeat the cleaning process using a fresh lens tissue.
  4. Re-install the optic, being careful not to scratch the surface. Note that a small arrow (>) is drawn on the side of all Coherent optics. When the optic is properly installed, this arrow will point into the laser cavity.
  5. Turn on the laser system, or unblock the pump laser beam. Using only the mount tilt controls of the optic that was cleaned, optimize the performance of the laser system. Do not clean another optic until the system performance meets or exceeds that previously recorded.

Optic Transport Fiber (Fiber Optic) Cleaning

For diode pumped laser systems (e.g., Verdi, AVIA, MBD-200, Azure, Vitesse, etc.) the optical transport fiber is sealed within the diode (FAP-I) assembly and should not require cleaning under normal operating conditions. When replacing the FAP-I assemblies of these systems, and for optical transport fibers in general, the optical surface should always be viewed with a magnifier to verify the presence of contamination before cleaning. Do not clean the fiber if there is no visible contamination.

The end of the fiber optic cable constitutes an optical surface. Do not allow the end of the fiber optic cable to make contact with any surface, including your hands.

Optics and optic coatings can be chipped or scratched easily. Wear finger cots, or powder free surgical gloves, while handling fiber optic cables. Only fresh (dry) spectroscopic grade Methanol should be used as a cleaning solvent. Do not use Acetone as a cleaning solvent on the fiber optical surfaces. It will dissolve the matrix which supports the fiber, and permanently destroy the optical transport fiber.


Multiline High-Reflector Cleaning

On some systems the high reflector (HR) is sealed to the tube and is not accessible. Do not attempt to extract and clean the optic. An example of a sealed mirror tube is shown in the figure below.

Handle laser optics with care. A scratch, trace of dirt, or film will diminish the laser’s efficiency. Before cleaning optics, be sure that your hands are clean and that a clean, cushioned work surface is available.

Optics and optic coatings can be easily chipped or scratched. To prevent damage when removing or replacing mirrors, always grasp the optic by the outer edge. Never touch the optical surfaces with your bare skin, the hemostats, or materials other than lens tissue. Only fresh (dry) spectroscopic grade Methanol should be used to clean optics.

Cleaning Procedure

  1. Close the intracavity shutter and position the appropriate power meter detector head in front of the laser system. Reopen the shutter and verity that the detector head has been positioned properly. The power meter detector head should be positioned as close to the laser head output aperture as possible. Care should also be taken to assure that a beam dump captures all back reflections from the detector surface.
  2. Depress the “Tune” button on the laser system remote control. This will place the laser system in the fixed Current mode of operation and disable PowerTrack, if equipped. Using the HR horizontal and vertical tilt controls optimize the laser system output power.
  3. Record the power, and, if possible, the transverse laser mode.
  4. Close the intracavity shutter, remove the knurled cap securing the multiline optic and holder, and remove the mirror holder (see figure above). Inspect the optic for contamination and damage. The optic should be cleaned only if contamination can clearly be seen.
    • A bright flashlight, held at a glancing angle of incidence with respect to the optical surface, is very helpful in identifying contaminated optics.
    • Breathe on the optic to determine if there is any damage to the coating. The surface should fog with no discoloration. If discoloration appears the coating has been damaged and the optic must be replaced.

  5. If required, clean the exposed (coated) surface of the high reflector using the Drop and Drag method. It should not be necessary to remove the optic from the holder.
  6. Reinstall the multiline mirror holder and knurled cap, open the intracavity shutter, and optimize the output power using the HR horizontal and vertical tilt controls. The observed power should be equal or greater than that previously measured. Do not adjust any other optics or controls until this is the case. If the previous power can not be achieved:
    • Remove the multiline holder and verify that the optic is properly seated, and was not been damaged by the cleaning or removal/reinstallation process.
    • Verify that that fresh spectroscopic grade methanol is being used, and re-clean the optic. Note that over time methanol will absorb water from the air, and this water will leave a film on an optical coating or surface.

  7. Once the laser system is optimized, re-press the Tune button. If equipped, verify that the PowerTrack LED is illuminated. If the order of the transverse mode was the cause for cleaning, verify that the mode is as expected and that the system aperture is set properly for your application.

Mounted Optics Cleaning

Optic cleaning is not a required component of a regular laser system maintenance schedule. Optics should only be cleaned as a corrective action for marked power decrease or poor mode quality. Optics should not be cleaned unless signs of contamination are clearly visible on the optic surfaces. Unnecessary cleaning will shorten the life span of the optical coating.

Optics and optic coatings can be easily damaged. Never touch the optical surfaces with bare skin, hemostats, or materials other than lens tissue.

The Hemostat and Lens Tissue Method

  1. If applicable, place the laser system in Current control mode of operation. For Ion laser systems disengage PowerTrack if this option is available. Record the laser system output power, and output mode characteristics if applicable. Turn off the laser system, or block the pump laser beam if the optic to be cleaned is in an oscillator or amplifier.
  2. Inspect the system optics for contamination. Clean an optic only if contamination is clearly visible. A bright flashlight, held a glancing angle of incidence with respect to the optical surface, can help to identify contaminated optics.
  3. Fold a lens tissue into a 1-cm (3/8-in.) wide strip, being careful not to touch the portion of the tissue that will contact the optic.
  4. Fold this strip upon itself twice and grasp near the fold with clean hemostats as shown in the figure below.
  5. Place a few drops of Methanol on the fold and shake off the excess.
  6. Make a single swipe across the surface of the optic. Do not re-use the lens tissue as particles of dust and other contaminates picked up from the surface of the optic may scratch if dragged across with a second swipe.
  7. Turn on the laser system, or unblock the pump laser beam. Using only the mount tilt controls of the optic that was cleaned, optimize the performance of the laser system. Do not clean another optic until the system performance meets or exceeds that previously recorded.

Brewster Window Cleaning

The laser system plasma tube will have zero, one, or two Brewster windows depending on the system type. Sealed mirror systems may have one window or no accessible windows. Other system types have two windows.

Great care should be taken when cleaning the plasma tube Brewster windows. A scratch on the window surface may degrade performance to the extent that the tube must be replaced. The Brewster window is located in a sealed cavity and rarely needs to be cleaned. Turn off the laser system before cleaning the Brewster window. Extremely high voltage is present adjacent to the window when the laser is on. This voltage may cause serious shock to the operator, or if shorted to ground may result in catastrophic damage to the plasma tube and/or power supply.

Cleaning Procedure
For the front window, slightly rotate the bellows back and forth while sliding the dust shield/bellows towards the front of the head to expose the Brewster window. There will be some resistance when sliding the bellows because the Teflon O-rings produce seals to the window stem and aperture transition tube.

  1. Close the intracavity shutter and position an appropriate power meter detector head in front of the laser system. Reopen the shutter and verity that the detector head has been properly positioned. The power meter detector head should be positioned as close to the laser head output aperture as possible. Care should also be taken to assure that a beam dump captures all back reflections from the detector surface.
  2. Depress the “Tune” button on the laser system remote control. This will place the laser system in the fixed Current mode of operation and disable PowerTrack, if equipped. Using the HR horizontal and vertical tilt controls optimize the laser system output power. Record the power, and if possible, the transverse laser mode.
  3. Turn off the laser key switch, but maintain facility electrical power.
  4. Remove the appropriate laser head sub-cover and expose the plasma tube Brewster window. For the rear window, slightly rotate the bellows back and forth while sliding the dust shield/bellows towards the rear of the head to expose the Brewster window. There will be some resistance when sliding the bellows because the Teflon O-rings produce seals to the window stem and aperture transition tube.
  5. Clean the Brewster window using the Hemostat and Lens Tissue method. Make a single wipe with a smooth continuous motion using light pressure. Do not reuse the lens tissue. Wipe in the correct direction as follows.
    • Always wipe the window TOWARD the dust shield. Never wipe the window toward the center of the laser.
    • At the start of the cleaning stroke, the lens tissue should be positioned just to the inside of the window edge as illustrated in the figure below. The edge of the window can be sharp, and chips of the window material may break off from the cleaning process. If these chips are dragged across the Brewster window, the surface of the window may be scratched
    • After cleaning the window, wait approximately 15-seconds for all solvent vapors to dissipate. Replace the bellow/dust shield using a slight back-and-forth rotational motion to overcome seal resistance while sliding . Ensure that the bellows are not overextended and have a good seal on both the window stem and the aperture transition tube. Extreme care should be taken to ensure that no intracavity components come in contact with the Brewster window.
    • Replace the laser head sub-cover and restart the laser system (key On).
    • Depress the Tune button on the remote and re-peak the laser system. Verify that the power is equal to or greater than the levels recorded before cleaning. If the output power is lower than previously measured the Brewster window should be re-cleaned. Do not clean another optic until all power levels are regained or exceeded.
    • Once the laser system is optimized, re-press the Tune button. If equipped, verify that the PowerTrack LED is illuminated. If the order of the transverse mode was the cause for cleaning, verify that the mode is as expected and that the system aperture and regulation mode are properly set for your application.


Troubleshooting information for Vitesse DPSS lasers.

Battery Requires Service

For Avia, Verdi and Vitesse Lasers

  • Allow time for the battery to recharge - The system tests the battery charge during the first few seconds after the system is powered on. Therefore, the only time the battery fault will be displayed is during system power-up. The warning “Battery Requires Service” indicates that the battery charge is low. The battery automatically recharges whenever the system is supplied with AC power. Leave the system powered on for at least 8 hours, to enable the battery to recharge. After this period, perform the complete shutdown procedure from the operator’s manual, and then turn the system on again. If the battery fault message is displayed again, schedule a service call to replace the battery. Recurring battery faults indicate the battery is no longer rechargeable.
  • Determine the battery charge - The battery charge can be queried by RS-232 communication. Refer to the Operator’s manual for complete information on establishing an RS-232 link between the laser and a computer. A fully charged battery has 12-13 Volts.

If the battery fault has been displayed, and it is necessary to remove AC power for more than a few seconds, be sure to run the LBO/SHG Cooldown program, before removing AC power. Refer to Operator’s Manual for instructions.

Beam Pointing Instability

For Vitesse Lasers

Stabilize head baseplate temperature.

Verify that the ambient temperature is not excessive, or abnormally unstable. If the head is water-cooled, verify the water flow and temperature setpoint are correct.

Run the laser at normal operating conditions, and record the head baseplate temperature hourly, over the course of a day, in order to determine the variation in the head baseplate temperature. Consider whether the variation in head baseplate temperature correlates with the variation in beam pointing. If the head baseplate temperature varies markedly throughout the day, water cooling of the baseplate is recommended.

All Vitesse models have a water-cooled baseplate that must be maintained at 25 ± 1ºCelsius.

Beam Quality

In general, there is very little that can be done to improve the mode of a solid state laser. The optics are permanently aligned, and cannot be adjusted. Mode problems occur rarely. When they do occur, they are often indicative of damage to an optic. Typically, the laser head must be returned to the factory to correct a mode problem. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

For Vitesse Lasers

  • Ensure the laser is running at within its limits. If necessary, follow the “Low Power” troubleshooting steps listed below.
  • Ultrafast lasers must run between 2 well-defined power limits – the “Q-Switching” limit is the low power limit, and the “CW breakthrough” limit is the high power limit. The mode quality can only be guaranteed if the laser power is between these 2 limits. Consult the data sheet, which shipped with the laser to ensure the laser is operating between these 2 limits.
  • Verify the vanadate, etalon, LBO and Ti:sapphire are at the correct setpoints - Access the “Servo Status” menu (a “Verdi Status” submenu). Verify the vanadate and etalon temperatures are equal to the values noted on the Customer Data sheet (which was shipped with the laser).
  • Access the “LBO Settings” menu, and verify the setpoint temperature (“Set”) is equal to the actual temperature (“T”).
  • Access the “Display A/D Reading” menu (a Vitesse Status submenu). Examine the value of “ThermV”. ThermV is a voltage proportional to the Ti:sapphire crystal temperature, and should be between 2.5 and 3.0 Volts.

Clogged Water Flow

For AVIA, Verdi and Vitesse Lasers

  • Ensure distilled water is used in the chiller. Do not use deionized water, or hard water - Deionized water is corrosive. Hard water contains dissolved minerals, which may eventually precipitate and clog small diameter fittings. Periodically replace the water in the chiller, to retard algae growth.
  • If using a Neslab CFT-25 chiller, clean the strainer - Consult the Neslab manual for instructions on cleaning the pump strainer.
  • If necessary, replace clogged fittings - Small diameter fittings, which have clogged with mineral deposits, may require replacement.
  • If necessary, circulate vinegar (5% acetic acid solution) throughout the chiller and baseplate, to dissolve mineral deposits - Circulate acetic acid solution only until the mineral deposits have dissolved. Remove the acetic acid solution from the chiller and baseplate, and thoroughly rinse the system with distilled water. Acetic acid is corrosive to metals, and must not be left in the system for an extended period of time.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Front Panel Failure

For AVIA, Verdi and Vitesse Lasers

  • Contact Coherent Service or your authorized Coherent representative to arrange for replacement of the front panel, or keyboard. - If the front panel pushbuttons, control knob, keyswitch, or display malfunction, they cannot be repaired, and must be replaced by an authorized Coherent service representative. Contact Coherent Technical Support or your local service representative for assistance.
  • Use RS-232 commands to communicate with the laser, and bypass front panel - If the laser cannot be controlled from the front panel due to a front panel malfunction, the laser can be fully controlled from a computer by establishing RS-232 communication between the laser and computer, and using the computer to issue the appropriate commands. This will enable full operation of the laser while waiting for the front panel to be replaced. Refer to the operator’s manual, Section titled External Computer Control, for complete details.

Low Power

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

For Vitesse Lasers

Operate the laser in Verdi light loop, and verify Verdi laser is operating at full power.

Access the “Light Loop Control” menu, scroll the arrow to “Verdi Light Loop Mode” and press “Select” to put the system into Verdi light loop. Press EXIT. Access the “Power Adjustment” menu, and set the Verdi power to full power. If the Verdi cannot maintain full power, follow the Verdi troubleshooting steps for “Low Power”.

  • Verify the Ti:sapphire crystal is at the correct temperature - Access the “Display A/D Reading” menu (a Vitesse Status submenu). Examine the value of “ThermV”. ThermV is a voltage proportional to the Ti:sapphire crystal temperature, and should be between 2.5 and 3.0 Volts.
  • Verify the PowerTrack PZTs are between 2 and 3 Volts - The PowerTrack PZTs optimize the alignment of the Verdi beam into the ultrafast head. They have a range of 0-5 Volts and should ideally be between 2 and 3 Volts. Operate the laser at normal operating conditions, and access the “PZT Control” menu (a Vitesse Setting submenu). Examine the values of PZT X and PZT Y. If either of the PZT voltages is less than 1 Volt or greater than 4 Volts, the PZTs will need to be recentered. Contact Coherent Service or your authorized Coherent representative for further assistance.

Not Modelocking

For Vitesse Lasers

Verify the baseplate is 25 ± 1ºCelsius.

Optimum alignment of the Verdi pump beam into the ultrafast head can only be achieved if the baseplate temperature is 25 ± 1ºCelsius. Adjust the chiller temperature as necessary to ensure the baseplate temperature is correct.

  • Verify automodelock, powertracking, peak hold and PZT control are correctly set - access the “Vitesse Settings Menu”. View the “Automodelock” menu. Verify Automodelock is ON. View the “PowerTrack” menu. Verify the Powertrack setting is ON. Access the “Peak Hold” menu. Verify Peak Hold is OFF. Access the “PZT Control” menu. Verify the PZT mode is AUTO.
  • Verify the Verdi and Vitesse CW powers are adequate.
Consult the Data Sheet shipped with the laser to ensure the Vitesse laser is lasing at a CW power between the Q-Switching and CW Breakthrough limits. Adjust the Verdi pump power accordingly. If the Verdi power is low, consult the Verdi “Low Power” troubleshooting page. If the Verdi power is normal, but the Vitesse CW power is low, consult the Vitesse “Low Power” troubleshooting page. If both Verdi and Vitesse CW powers are normal, but the systems will not modelock, put the system in Standby, and attempt to restart the system. If the modelocking problem occurs repeatedly, despite adequate Vitesse CW power, contact Coherent Service or your authorized Coherent representative.

Over Current Fault

When the output power of Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults. Refer to the troubleshooting advice for “Low Power”.

Verdi “Low Power” troubleshooting steps:

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Verify the vanadate, etalon, Diodes, and LBO are at the correct operating temperatures.

The temperatures at which the vanadate, etalon, Diodes and LBO crystals perform most efficiently are determined when the laser is built. These optimum operating temperatures are listed on the Customer Data Sheet, which was shipped with the laser. Refer to this document. Access the “Temperature Set Points” menu, and verify that the “Set Pt” (the set temperature) and the “Read T” (the actual temperature) are equal to the temperature noted on the Data Sheet. The LBO or Diode temperatures may be slightly different than the value noted on the Data sheet, if the LBO or Diode optimizations have been run.

  • Optimize the LBO temperature.

The LBO temperature may require periodic reoptimization. However, this is only recommended for 2 and 5 Watt systems. Do not run the LBO optimization program if the laser is an 8 or 10 Watt laser, as this may cause the laser performance to degrade, rather than improve. To run the LBO optimization, operate the laser at full power, or at the highest operable power. The optimization program will not run unless the laser is operating at > 80% of full power. Access the “LBO Optimization” menu, and press “Select” to initiate the optimization. The optimization will require approximately 45 minutes, and will display a message when complete.

  • Evaluate the FAP power, by looking at the “Diode Parameters” menu.

Operate the laser at the highest power possible. Access the “Diode Parameters” menu. Examine the values for “Diode 1 Photocell” and “Diode 2 Photocell”. If the FAP modules are operating at full power, the photocell voltages should be close to 2.5 Volts. If either of these voltages is significantly higher or lower than 2.5 Volts, this may indicate a FAP failure. Contact Coherent Service, or your authorized representative for further troubleshooting assistance.

Vitesse “Low Power” troubleshooting steps:

Operate the laser in Verdi light loop, and verify Verdi laser is operating at full power.

Access the “Light Loop Control” menu, scroll the arrow to “Verdi Light Loop Mode” and press “Select” to put the system into Verdi light loop. Press EXIT. Access the “Power Adjustment” menu, and set the Verdi power to full power. If the Verdi cannot maintain full power, follow the Verdi troubleshooting steps for “Low Power”.

  • Verify the Ti:sapphire crystal is at the correct temperature - access the “Display A/D Reading” menu (a Vitesse Status submenu). Examine the value of “ThermV”. ThermV is a voltage proportional to the Ti:sapphire crystal temperature, and should be between 2.5 and 3.0 Volts.
  • Verify the PowerTrack PZTs are between 2 and 3 Volts - The PowerTrack PZTs optimize the alignment of the Verdi beam into the ultrafast head. They have a range of 0-5 Volts and should ideally be between 2 and 3 Volts. Operate the laser at normal operating conditions, and access the “PZT Control” menu (a Vitesse Setting submenu). Examine the values of PZT X and PZT Y. If either of the PZT voltages is less than 1 Volt or greater than 4 Volts, the PZTs will need to be recentered. Contact Coherent Service or your authorized Coherent representative for further assistance.

Power Fluctuation

For Vitesse Lasers

Verify power instability with an external power meter.

To verify whether the instability is caused by the laser, or the photodiode electronics, use an external power meter or photodiode to examine the laser stability.

  • Verify laser is reliably modelocked, and PowerTrack is operating - Access the “Power Track” menu (a Vitesse Setting submenu) and verify that both the “Power Track setting” and “Power Track status” are ON. Access the “Automodelock” menu (a Vitesse Setting submenu) and verify that “Automodelock setting” is ON. Verify the system is modelocked, as indicated on line 2 of the top level menu.
  • Operate laser in Verdi light loop - To determine whether the power instability originates with the Verdi pump laser or the ultrafast head, access the “Light Loop Control” menu and set the laser to “Verdi Light Loop Mode”. Re-evaluate the power stability.
  • Stabilize head baseplate temperature. Access the “PZT Control” menu (a Vitesse Setting submenu). Verify the “PZT X” and “PZT Y” values are between 2 and 3 Volts (ideally). Ensure the “PZT mode” is AUTO. PZT values which fall in the ranges 1-2 Volts, or 3-4 Volts are acceptable, but PZT values which are < 1 Volt, or > 4 Volts indicate the ultrafast head is significantly misaligned, and the PZTs are at the extremes of their ranges, in order to compensate. If the PZTs are toward the extremes of their range (<1 Volt or >4 Volts), ensure the baseplate temperature is 25 ± 1ºCelsius. If the baseplate temperature is 25 ± 1ºCelsius, but the PZTs are at the extremes, the PZTs will need to be recentered. Contact Coherent Service or your authorized Coherent representative.
  • Verify PZTs are mid-range, approximately 2-3 Volts.

Access the “Peak Hold” menu (a Vitesse Setting submenu). Verify the “Peak Hold setting” is OFF.

PZT Out of Range

For Vitesse Lasers

Verify the baseplate is 25 ± 1ºCelcius.

In order to achieve optimum alignment of the Verdi pump beam into the ultrafast laser head, the baseplate temperature must be 25 ± 1ºC. If the temperature deviates appreciably from this value, the PZTs will compensate, but if the temperature is too far from 25ºC, the PZTs will reach the end of their range (0-5 Volts). Adjust the chiller temperature as necessary to ensure the baseplate temperature is correct. Normally a chiller reservoir temperature of approximately 20ºC results in a baseplate temperature of 25ºC.

Verify the Verdi pump laser is at the correct power to generate Vitesse power between the Q-Switch and CW-Breakthrough limits. If the Verdi pump power is too low, the response of the PZTs may be adversely affected.

  • Verify the Verdi laser is at the correct power.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Shutter Mismatch Fault

For AVIA, Verdi and Vitesse lasers – Clear the fault. Retry the shutter. If fault occurs repeatedly, schedule a service call to replace the shutter assembly. Shutter mismatch faults occur when the system CPU indicates the shutter is in one particular state (either open or closed) but the shutter sensor indicates the shutter is in the opposite state. If this fault occurs repeatedly, the cause may be either a mechanical failure of the shutter, or an electrical failure of the sensor. Contact Coherent Technical Support or your local service representative for assistance.​


Troubleshooting information for Verdi DPSS lasers.

Battery Requires Service

For Avia, Verdi and Vitesse Lasers

  • Allow time for the battery to recharge - The system tests the battery charge during the first few seconds after the system is powered on. Therefore, the only time the battery fault will be displayed is during system power-up. The warning “Battery Requires Service” indicates that the battery charge is low. The battery automatically recharges whenever the system is supplied with AC power. Leave the system powered on for at least 8 hours, to enable the battery to recharge. After this period, perform the complete shutdown procedure from the operator’s manual, and then turn the system on again. If the battery fault message is displayed again, schedule a service call to replace the battery. Recurring battery faults indicate the battery is no longer rechargeable.
  • Determine the battery charge - The battery charge can be queried by RS-232 communication. Refer to the Operator’s manual for complete information on establishing an RS-232 link between the laser and a computer. A fully charged battery has 12-13 Volts.

If the battery fault has been displayed, and it is necessary to remove AC power for more than a few seconds, be sure to run the LBO/SHG Cooldown program, before removing AC power. Refer to Operator’s Manual for instructions. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Beam Pointing Instability

For Verdi Lasers

  • Stabilize head baseplate temperature - Verify that the ambient temperature is not excessive, or abnormally unstable. If the head is water-cooled, verify the water flow and temperature setpoint are correct.

Run the laser at normal operating conditions, and record the head baseplate temperature hourly, over the course of a day, in order to determine the variation in the head baseplate temperature. Consider whether the variation in head baseplate temperature correlates with the variation in beam pointing. If the head baseplate temperature varies markedly throughout the day, water cooling of the baseplate is recommended.

Water-cooling of the head is required only for V10 and V18 lasers, but pointing stability will be markedly enhanced for all powers of Verdi lasers, if the head is water-cooled. If the Verdi laser is used in an application where pointing stability is a major concern, the head should be water-cooled. Contact Coherent Service or your authorized Coherent representative for further details.

Beam Quality

In general, there is very little that can be done to improve the mode of a solid state laser. The optics are permanently aligned, and cannot be adjusted. Mode problems occur rarely. When they do occur, they are often indicative of damage to an optic. Typically, the laser head must be returned to the factory to correct a mode problem. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

For Verdi Lasers

  • Ensure the laser is running at full power. If necessary, follow the “Low Power” troubleshooting tips.
  • At powers less than 0.5 Watt, the laser may be too close to the lasing threshold to meet mode specifications. If it is desired to run the laser at low power, the recommended method is to run the laser at a power of at least 1 Watt, and use a series of external beamsplitters to reduce the laser beam power.
  • Verify the vanadate, etalon and LBO temperatures are at the correct setpoints - The temperatures at which the vanadate, etalon and LBO crystals perform most efficiently are determined when the laser is built. These optimum operating temperatures are listed on the Customer Data Sheet, which was shipped with the laser. Refer to this document. Access the “Temperature Set Points” menu, and verify that the “Set Pt” (the set temperature) and the “Read T” (the actual temperature) are equal to the temperature noted on the Data Sheet. The LBO temperature may be slightly different than the value noted on the Data sheet, if the LBO optimization program has been run. Verify the LBO “Read T” value is equal to the LBO “Set Pt” value.

Clogged Water Flow

For AVIA, Verdi and Vitesse Lasers

  • Ensure distilled water is used in the chiller. Do not use deionized water, or hard water - Deionized water is corrosive. Hard water contains dissolved minerals, which may eventually precipitate and clog small diameter fittings. Periodically replace the water in the chiller, to retard algae growth.
  • If using a Neslab CFT-25 chiller, clean the strainer - Consult the Neslab manual for instructions on cleaning the pump strainer.
  • If necessary, replace clogged fittings - Small diameter fittings, which have clogged with mineral deposits, may require replacement.
  • If necessary, circulate vinegar (5% acetic acid solution) throughout the chiller and baseplate, to dissolve mineral deposits - Circulate acetic acid solution only until the mineral deposits have dissolved. Remove the acetic acid solution from the chiller and baseplate, and thoroughly rinse the system with distilled water. Acetic acid is corrosive to metals, and must not be left in the system for an extended period of time.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Front Panel Failure

For AVIA, Verdi and Vitesse Lasers

  • Contact Coherent Service or your authorized Coherent representative to arrange for replacement of the front panel, or keyboard - If the front panel pushbuttons, control knob, keyswitch, or display malfunction, they cannot be repaired, and must be replaced by an authorized Coherent service representative. Contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.
  • Use RS-232 commands to communicate with the laser, and bypass front panel - If the laser cannot be controlled from the front panel due to a front panel malfunction, the laser can be fully controlled from a computer by establishing RS-232 communication between the laser and computer, and using the computer to issue the appropriate commands. This will enable full operation of the laser while waiting for the front panel to be replaced. Refer to the operator’s manual, Section titled External Computer Control, for complete details.

Low Power

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

For Verdi Lasers

Verify the vanadate, etalon, Diodes, and LBO are at the correct operating temperatures.

The temperatures at which the vanadate, etalon, Diodes and LBO crystals perform most efficiently are determined when the laser is built. These optimum operating temperatures are listed on the Customer Data Sheet, which was shipped with the laser. Refer to this document. Access the “Temperature Set Points” menu, and verify that the “Set Pt” (the set temperature) and the “Read T” (the actual temperature) are equal to the temperature noted on the Data Sheet. The LBO or Diode temperatures may be slightly different than the value noted on the Data sheet, if the LBO or Diode optimizations have been run

  • Optimize the LBO temperature - The LBO temperature may require periodic reoptimization. However, this is only recommended for 2 and 5 Watt systems. Do not run the LBO optimization program if the laser is an 8 or 10 Watt laser, as this may cause the laser performance to degrade, rather than improve. To run the LBO optimization, operate the laser at full power, or at the highest operable power. The optimization program will not run unless the laser is operating at > 80% of full power. Access the “LBO Optimization” menu, and press “Select” to initiate the optimization. The optimization will require approximately 45 minutes, and will display a message when complete.
  • Evaluate the FAP power, by looking at the “Diode Parameters” menu - Operate the laser at the highest power possible. Access the “Diode Parameters” menu. Examine the values for “Diode 1 Photocell” and “Diode 2 Photocell”. If the FAP modules are operating at full power, the photocell voltages should be close to 2.5 Volts. If either of these voltages is significantly higher or lower than 2.5 Volts, this may indicate a FAP failure. Contact Coherent Service, or your authorized representative for further troubleshooting assistance.

Not Single Frequency

Verify the laser is operating at power greater than 0.5 Watt.

When the laser is running at a power less than 0.5 Watt, it is operating close to the lasing threshold. Under these low power conditions, single frequency operation cannot be guaranteed. Ensure the laser is operating at a power greater than 0.5 Watt. If a lower power laser beam is required, operate the laser at a higher power, and use a series of beamsplitters to reduce the laser power.

  • Verify the etalon temperature is correct - The temperature at which the etalon delivers single frequency performance is determined in the factory. Refer to the Data Sheet, which shipped with the laser to verify that the etalon is at the correct temperature. The etalon temperature may be viewed in the “Temperature Set Points” menu
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Over Current Fault

When the output power of Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults. Refer to the troubleshooting advice for “Low Power”.

​Power Fluctuation

Verify power instability with an external power meter.

To verify whether the instability is caused by the laser, or the photodiode electronics, use an external power meter or photodiode to examine the laser stability.

  • If possible, identify any characteristic frequency of the power fluctuation - Some customers, especially those using the Verdi laser for pumping ultrafast lasers, may be able to easily measure the characteristic frequency of the power fluctuation if the fluctuation is periodic in nature. This may assist with diagnosis of the problem. If the power fluctuation is sinusoidal in nature, with a frequency of 3 kHz, the likely cause is that the photocell gain is too high. Contact Coherent Service or your authorized Coherent representative for further assistance.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Shutter Mismatch Fault

For AVIA, Verdi and Vitesse lasers

  • Clear the fault. Retry the shutter. If fault occurs repeatedly, schedule a service call to replace the shutter assembly.

Shutter mismatch faults occur when the system CPU indicates the shutter is in one particular state (either open or closed) but the shutter sensor indicates the shutter is in the opposite state. If this fault occurs repeatedly, the cause may be either a mechanical failure of the shutter, or an electrical failure of the sensor. Contact Coherent Technical Support or your local service representative for assistance.


Troubleshooting Ultrafast Oscillators and Amplifiers


Reminder for All Evolution Pump Laser Users

Reminder for All Evolution Pump Laser Users

Laser Optic Cleaning

To maximize performance and longevity, there are specific cleaning procedures for the handling and cleaning of various optical components. With such materials and variations, Coherent offers a number guides for your reference.

If your optic is not listed here, please contact us.​


AVIA Troubleshooting

Battery Requires Service

For Avia, Verdi and Vitesse Lasers

  • Allow time for the battery to recharge - The system tests the battery charge during the first few seconds after the system is powered on. Therefore, the only time the battery fault will be displayed is during system power-up. The warning “Battery Requires Service” indicates that the battery charge is low. The battery automatically recharges whenever the system is supplied with AC power. Leave the system powered on for at least 8 hours, to enable the battery to recharge. After this period, perform the complete shutdown procedure from the operator’s manual, and then turn the system on again. If the battery fault message is displayed again, schedule a service call to replace the battery. Recurring battery faults indicate the battery is no longer rechargeable.
  • Determine the battery charge - The battery charge can be queried by RS-232 communication. Refer to the Operator’s manual for complete information on establishing an RS-232 link between the laser and a computer. A fully charged battery has 12-13 Volts.

If the battery fault has been displayed, and it is necessary to remove AC power for more than a few seconds, be sure to run the LBO/SHG Cooldown program, before removing AC power. Refer to Operator’s Manual for instructions.

If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Beam Pointing Instability

For AVIA Lasers

Stabilize head baseplate temperature.
Verify that the ambient temperature is not excessive, or abnormally unstable. If the head is water-cooled, verify the water flow and temperature setpoint are correct.

  • Run the laser at normal operating conditions, and record the head baseplate temperature hourly, over the course of a day, in order to determine the variation in the head baseplate temperature. Consider whether the variation in head baseplate temperature correlates with the variation in beam pointing. If the head baseplate temperature varies markedly throughout the day, water cooling of the baseplate is recommended.
  • Perform all Temperature optimizations and Therma Track optimizations (for non0Ultra systems) as described in the operator’s manual.

If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Beam Quality

In general, there is very little that can be done to improve the mode of a solid state laser. The optics are permanently aligned, and cannot be adjusted. Mode problems occur rarely. When they do occur, they are often indicative of damage to an optic. Typically, the laser head must be returned to the factory to correct a mode problem. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

For AVIA Lasers

Ensure the laser is running at full power. If necessary, follow the “Low Power” troubleshooting steps.

At very low power, the laser may be too far outside its normal operating parameters to meet mode specifications. If the mode quality is acceptable at higher powers, but not at low powers, and a low power beam is required, the recommended method is to run the laser at higher power, and use a series of external beamsplitters to reduce the laser beam power.

  • Optimize ThermaTrack.

ThermaTrack is a moving mirror whose position can be adjusted to compensate for thermal lensing effects of the laser rods. The position of ThermaTrack must be reoptimized every time the diode pump power or repetition rate is adjusted. It can be optimized from the main Avia menu, by scrolling the arrow to “ThermaTrack” and pushing in the front panel control knob. This initiates an automatic optimization of the ThermaTrack mirror, which will result in optimum laser power and mode quality.

  • Optimize the temperatures of the SHG, THG and diodes. Verify the laser rods are at the correct setpoint temperature.

It is unlikely that reoptimizing the temperatures of the crystals and diodes will solve a serious mode problem. However, a minor mode problem may be alleviated by ensuring the crystals are operating at peak efficiency. To optimize the SHG, operate the laser at normal operating conditions (power and repetition rate), ensure the ThermaTrack adjustment is optimized, and then access the “Temperature Optimization” menu. Scroll the arrow to “SHG Temperature” and press “Select”. Press “Select” again to initiate the temperature optimization, which will require approximately 5 minutes to complete. Repeat this procedure to optimize the THG, Diode 1 and Diode 2 temperatures.

The laser rods setpoint temperature cannot be adjusted from the temperature they were set to in the factory, which is 25ºC. Access the Servo Status menu and verify the laser rods are locked at this temperature.

  • Shift the THG crystal to a new spot.

Any crystal in which UV light is generated, will eventually become damaged by the UV light. For this reason, the THG crystal in the Avia laser has at least 20 sites. Shift the THG crystal to a new spot, to determine whether a burn or defect on the existing site is causing the mode problem. To shift the crystal spot, turn the Pulsing off, access the “Crystal Shifter” menu, and turn the knob to access an unused crystal spot. Operate the laser at normal operating conditions, and carefully examine the mode to determine if the mode problem has been corrected. If the mode is not improved, shift the THG crystal back to the original spot.

Clogged Water Flow

For AVIA, Verdi and Vitesse Lasers

  • Ensure distilled water is used in the chiller. Do not use deionized water, or hard water - Deionized water is corrosive. Hard water contains dissolved minerals, which may eventually precipitate and clog small diameter fittings. Periodically replace the water in the chiller, to retard algae growth.
  • If using a Neslab CFT-25 chiller, clean the strainer - Consult the Neslab manual for instructions on cleaning the pump strainer.
  • If necessary, replace clogged fittings - Small diameter fittings, which have clogged with mineral deposits, may require replacement.
  • If necessary, circulate vinegar (5% acetic acid solution) throughout the chiller and baseplate, to dissolve mineral deposits - Circulate acetic acid solution only until the mineral deposits have dissolved. Remove the acetic acid solution from the chiller and baseplate, and thoroughly rinse the system with distilled water. Acetic acid is corrosive to metals, and must not be left in the system for an extended period of time.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Front Panel Failure

For AVIA, Verdi and Vitesse Lasers

  • Contact Coherent Service or your authorized Coherent representative to arrange for replacement of the front panel, or keyboard - If the front panel pushbuttons, control knob, keyswitch, or display malfunction, they cannot be repaired, and must be replaced by an authorized Coherent service representative. Contact Coherent Technical Support or your local service representative for assistance.
  • Use RS-232 commands to communicate with the laser, and bypass front panel - If the laser cannot be controlled from the front panel due to a front panel malfunction, the laser can be fully controlled from a computer by establishing RS-232 communication between the laser and computer, and using the computer to issue the appropriate commands. This will enable full operation of the laser while waiting for the front panel to be replaced. Refer to the operator’s manual, Section titled External Computer Control, for complete details.

Low Power

When the output power of Avia, Verdi and Vitesse lasers is low, the laser will automatically respond by increasing the current to the FAPs. Eventually, the laser will reach the software-controlled current maximum, and an “Over Current Fault” will result. Over current faults are essentially low power faults.

Note: Therma Track is not available for AVIA Ultra systems.

Since the optics of the solid state lasers are permanently aligned, there are no optical positioning adjustments that can be made to increase power. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

For AVIA Lasers

Optimize ThermaTrack.

  • ThermaTrack is an end mirror of the laser cavity that translates in order to shorten or lengthen the laser cavity. In this way, the laser cavity dimension can be optimized to respond to thermal lensing of the laser rods. The degree of thermal lensing depends on the laser power and repetition rate. Therefore, any time the diode pump power or rep rate is changed, ThermaTrack should be reoptimized. To optimize ThermaTrack, operate the laser at the desired conditions. From the top-level menu, scroll the arrow to point to the fourth display line, which reads “ThermaTrack”, and press the front panel control knob to initiate the optimization. The ThermaTrack mirror will automatically move through its entire range, and settle at the position, which results in the highest laser power.
  • Optimize the SHG, THG, Diode 1 and Diode 2 temperatures - The temperatures at which the SHG, THG, Diode 1 and Diode 2 perform most efficiently are determined when the laser is built. However, these temperatures should be periodically re-optimized. To do so, operate the laser at normal operating conditions (power and repetition rate), ensure the ThermaTrack adjustment is optimized, and then access the “Temperature Optimization” menu. Scroll the arrow to “SHG Temperature” and press “Select”. Press “Select” again to initiate the temperature optimization, which will require approximately 5 minutes to complete. Repeat this procedure to optimize the THG, Diode 1 and Diode 2 temperatures.
  • Repeat ThermaTrack Optimization.
  • Shift the THG crystal to a new spot - A burned or damaged area on the THG crystal will cause low power. To shift the THG crystal to a new spot, turn Pulsing OFF, and then access the “Crystal Shifter” menu. Turn the front panel knob to access the next unused crystal spot. Turn the diodes and pulsing ON and carefully examine the mode. If the power improves, remain at this new crystal spot. If there is no power improvement, return to the original THG crystal spot.
  • If the laser in question is running version 3.32 Power Supply software or above, it is possible to do a preliminary check on the output power of the pump diodes through the software. To check which software version the laser has, simply turn the key switch on the front panel to standby and press Exit until the top-level menu is displayed. If the Power Supply version is 3.32 or above, continue with this step. If not, go on to the next step. Scroll to the menu titled “Diode Parameters” and look at the values for Diode 1 Photocell and Diode 2 Photocell. If either of these values are significantly different than 2.50 Volts, it may indicate a pump diode failure. If so, please contact your Coherent Rep for Service and further troubleshooting.

No Pulsing

For AVIA Lasers

Verify the external enable signal is supplied.

Verify an external enable signal is being supplied. This can be done in 3 ways – a shorting BNC can be connected to the external enable BNC connection on the rear panel of the power supply, a user-supplied external enable signal can be input at the external enable BNC, or , a user-supplied external enable signal can be input at the 25-pin D-connector on the rear panel of the power supply – contact the Operator’s manual for details and pinouts.

  • Verify external trigger signal is present - If the laser is being triggered with an external trigger, verify that the external trigger is being supplied, and is of adequate voltage and current. Refer to the Operator’s manual for details.
  • Attempt to operate the laser using Continuous Mode, Internal trigger - Operate the laser in Internal trigger (with the shorting BNC connected to the External Enable connector on the rear panel of the power supply) to determine whether the fault originates with the external trigger input. If the laser operates in Internal trigger mode, but not external mode, verify the external trigger inputs (trigger and external enable) are correctly provided.

If the laser does not operate in Internal trigger mode, verify the diodes and pulsing are turned ON. Access the “Pulse Delete Adjust/ThermEQ Adjust” menu. Set Pulse Delete/ThermEQ OFF. Check for milliWatt-level CW laser output. (Refer to the next troubleshooting step for further details.) If CW emission is present when the diodes and pulsing are turned on, the RF generator or Pulse board may be damaged. Contact Coherent Service or your authorized Coherent representative for further assistance.

  • Check for laser output.

Carefully measure the laser output with an external power meter. A malfunction of the photocells can cause the front panel display to report “No Pulsing” even though the laser is operating normally. Contact Coherent Service or your authorized Coherent representative to arrange servicing.

If the laser is, in fact, not pulsing, but rather, emitting a low energy (milliWatt) CW beam, access the “Pulse Delete Adjust/ThermEQ Adjust” menu. Set Pulse Delete/ ThermEQ OFF. If the laser is still emitting a low energy CW beam, the most likely cause is a failure of the RF generator or Pulse board. Contact Coherent Service or your authorized Coherent representative to arrange servicing.

Power Fluctuation

For AVIA Lasers

Operate laser with Internal triggering.

Any instability in the external triggering circuitry, such as missing triggers, may appear as a power fluctuation. Disconnect the cable, which delivers the external trigger signals, and operate the laser with internal triggering. Re-evaluate the power stability. Examine the external trigger signals on an oscilloscope to verify they are of the correct voltage and the intended repetition rate.

  • Verify power instability with an external power meter.

If possible, use a fast photodiode and oscilloscope to examine the power stability. One recommended photodiode is the Electro-Optics Technology model #ET-2020, with <1.5 nanoseconds rise time. This is a biased silicon photodetector. Refer to the website at: http://www.eotech.com.

  • If the laser is being operated in “Bursts” (on for several seconds then off for several seconds to several minutes) then the power stability can be improved by using the ThermEQ feature. Scroll to the “Pulse Delete/ThermEQ Adjust” menu and press select. Scroll the arrow down to the bottom line of the menu and press Select until the line reads “ThermEQ: On” and then press exit and test the operation of the laser.
  • If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Shutter Mismatch Fault

For AVIA, Verdi and Vitesse lasers

  • Clear the fault. Retry the shutter. If fault occurs repeatedly, schedule a service call to replace the shutter assembly.
  • Shutter mismatch faults occur when the system CPU indicates the shutter is in one particular state (either open or closed) but the shutter sensor indicates the shutter is in the opposite state. If this fault occurs repeatedly, the cause may be either a mechanical failure of the shutter, or an electrical failure of the sensor. Contact Coherent Technical Support or your local service representative for assistance.


Diode-Pumped Solid-State Laser Troubleshooting

Troubleshooting information for your DPSS laser system.

Guidelines to troubleshooting the Avia, Verdi and Vitesse product lines.


Service Request Form

Please use the form on this page to submit your requests for Coherent laser support and service. Please fill out the form in its entirety prior to submitting.

You will receive an automated e-mail confirmation upon submitting your request. We will be in contact with you within one business day.


Service Parts and Logistics

Coherent’s service, global logistics and warehouses are strategically located in the USA, Europe and Asia. This ensures that service and spare parts are stored close to your Coherent systems.

We actively plan and stock more than 14.000 parts for fast and reliable delivery to thousands of customers around the world. As Coherent original spare parts are perfectly designed for your laser’s lifecycle - productivity and safety of your laser system is ensured to protect your investment.

Coherent’s engineering staff will help you find the correct spare part for your laser system.

Select your location to find your regional support contact.


Technical Support for Laser Machining Tools

Phone Support

Coherent’s Laser Machining Centers are the most compact, flexible laser cutting tools available for any production shop. Production Automation options are available for enhanced productivity.

Worldwide phone support hotlines ensure that an expert drawing on the resources of a global company can always be reached. To reach a product support engineer, please contact us.

Warranty

All laser machining tools come with a 12 month warranty that covers service and parts. For additional information on warranty terms, please contact Coherent’s Service Department.

Please contact Coherent Service with any support or warranty questions at:

LMTservice@coherent.com or 1-866-247-4767 (Outside the U.S. 01-408-764-4983)


Lens/Optics Cleaning Procedure for Laser Machining Tools

Lens/Optics Cleaning Procedure for Laser Machining Tools

LIGHTCELL Preinstallation Manual

LIGHTCELL Preinstallation Manual

LIGHTCELL Preinstallation Manual

LIGHTCELL Preinstallation Manual

METABEAM Preinstallation Manual

METABEAM Preinstallation Manual

OMNIBEAM Preinstallation Manual

OMNIBEAM Preinstallation Manual

Service Terms and Conditions

Terms and Conditions

Coherent provides web technical assistance as a service to its customers and assumes no liability thereby for any injury or damage that may occur contemporaneous with such services.

These support services do not affect, under any circumstances, the terms of any warranty agreement between Coherent and the buyer. The procedures that follow may require that the laser system be operatedwith one or more interlocks defeated and/or protective covers open or removed. This may expose the operator to potentially hazardous visible and invisible radiation. Laser housings should only be opened, or removed, by trained personnel cognizant of the hazards involved. Safety glasses, appropriate for the wavelengths being produced by the laser system, should always be worn during servicing and operation.

It is the responsibility of the laser purchaser to ensure that laser safety policies and practices are in place, that training on these policies and practices has been provided to all operators and maintenance personnel, and that these policies and practices are adhered to during the maintenance and operation of the laser system. Operation of any Coherent laser with any of its interlocks defeated is always at the operator’s own risk.

The documents contained on this site are copyrighted with all rights reserved. Under the copyright laws, these documents may not be copied in whole or in part or reproduced in any other media without the express written permission of Coherent, Inc. Permitted copies must carry the same proprietary and copyright notices as were affixed to the original. This exception does not allow copies to be made for others, whether or not sold, but all the material purchased may be sold, given or loaned to another person. Under the law, copying includes translation into another language.

Coherent and the Coherent Logo are registered trademarks of Coherent, Inc.

Every effort has been made to ensure the accuracy of the data given on this site. The information, figures, tables, specifications and schematics contained herein are subject to change without notice. Coherent makes no warranty or representation, either expressed or implied, with respect to these documents. In no event will Coherent be liable for any direct, indirect, special, incidental or consequential damages resulting from any defects in its documentation.

Warranty Information for Lasers

All electronic and mechanical parts are warranted against defects in materials and workmanship under normal use. The obligation of Coherent is limited to repairing or replacing equipment that proves to be defective during the warranty period without charge. Our warranties do not cover damages due to misuse, negligence, or accidents due to installations, repairs or adjustments not specifically authorized by a certified Coherent engineer.

If you have questions or concerns regarding warranty information, contact us.


CO2 Performance Package

The Diamond laser series is a modular, RF excited, sealed industrial CO2 pulsed laser. The Diamond K-150/K-200/K-250/K-500 Performance Package consists of a laser head, a power module, a remote control unit and interconnection cables. The power module contains:

  • RF amplifier
  • DC power supply
  • Diamond digital interface (DDI) board
  • Internal heat exchanger

Head Cover Light On

  1. Verify that the head cover is installed properly.
  2. If the light is still on remove the cover and install interlock defeat, which is shipped in the maintenance kit. If the indicator goes off when interlock defeat is installed, verify that the head cover and interlock pins are making contact. Clean contact area if necessary
  3. If light is still on replace the headboard per procedure in the operator’s manual.
  4. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Head Thermal Light On

Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter):

  1. Verify that the cooling water temperature is within specifications for your laser model as stated in the operator’s manual.
  2. Verify that the cooling water flow through the laser system is within the specifications for your laser model as stated in the operator’s manual.
  3. Check continuity of thermal switch located on the shutter blade. Disconnect the shutter cable from the shutter assembly. Measure the resistance between pins 6 and 12 at the connector. The acceptable value is 20 ohms when the shutter blade is less than 35ºC.
  4. Place a Jumper between R9 and TP1 on the headboard. If the head thermal light goes off, then replace the shutter cable. If light stays on replace the headboard per the instructions in the operator’s manual; if light is still on replace the power module.
  5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Laser System Doesn’t Turn On

Related symptoms: When I turn the laser system on nothing happens.

Background information: The laser system has an interlock circuit that the customer/integrator can interface to. This interlock circuit prevents the laser from turning on if a safety requirement is not met. The interlock circuit uses a 5 VDC power supply that turns on the main 48 VDC power supply when all of the interlocks, external and internal are properly connected.

  1. Verify that the input voltage selector on the power module is set to the correct input line voltage for your facility. See Chapter titled “Utility Requirements and System Installation”, paragraph titled “Changing Input Voltage for Power Module” in the Operator’s Manual.
  2. If the laser system has external safety interlocks installed, verify that these interlocks are okay.
  3. Verify that the power module is connected to the input line voltage and that the input line voltage is ok. See Chapter titled “Utility Requirements and System Installation”, table titled “Utility Requirements” in the Operator’s Manual for more information on input line voltage requirement.
  4. Verify that all cables are connected properly.
  5. Verify that the interlock + connector (15 pin DB connector) is plugged into J11 on the remote control unit.
  6. Verify that all key switches are on.

Basic troubleshooting:

  1. Verify that the J7 user connector (9 pin DB connector) is plugged into the DDI box.

Performance Package troubleshooting:

  1. Verify that the power module fuse is okay.
  2. Verify that the interlock connector (9 pin DB connector) is plugged into the power module.
  3. Verify that the emergency stop switch is not pushed in. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

Laser System Shuts Down at High Power Setting

Related symptoms; Laser system won’t run above certain duty cycles. Laser system will shut down when modulation is turned on.

  1. Set modulation to 1 kHz 20% duty cycle. Increase modulation, if modulation shuts down at around 30% duty cycle. Replace the power module if you own a performance package. If you own a basic system, replace the DC power supply.
  2. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Low Laser Power

Related symptoms; laser output skips.

  1. Check condition of all system beam delivery optics. These optics must be free of dirt, dust and smoke for full delivery of power to the work surface. Consult the system integrator for cleaning methods or replacement optics. This must be done before proceeding to next section.
  2. Verify that modulation is input to laser at correct duty cycle.If system is integrated, Coherent’s 60% duty cycle may correspond to Integrator’s 100%. If in doubt, check with system integrator to verify. NOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam. NOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam.
  3. Disconnect all external controls. Set the remote to local modulation and run at 1000 µs period, 600 µs pulse width. If a power meter/probe is available measure the output power at this setting. Check purge gas and purge gas filter, see the chapter titled “Utility Requirements and System Installation” in the Operator’s Manual for details. If RF warning lights are on, troubleshoot as necessary.
  4. Replace power module, laser head, and/or RF cable if necessary depending on warning lights and troubleshooting results.
  5. If after verifying and/or correcting the checklist items the system is still not operating (please note the pulse width and pulse period for low power operation) contact Coherent Technical Support or your local service representative for assistance.

No Aiming Beam

Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter):

  1. Verify that aiming beam ON/OFF switch is ON.
  2. Verify shutter is closed; the aiming beam will only output if shutter is closed.
  3. If shutter is closed, verify that 5 VDC is available on the headboard. The green LED CR5 will be lit when 5 VDC is on. If no 5 VDC then replace the headboard. To verify that the correct signals are being sent to the aiming beam laser diode, use the following procedure.
    • Turn system off. Turn aiming beam switch on remote control off.
    • Remove the head cover, following procedures in the operator’s manual.
    • Bypass the head cover interlock, following procedures in the operator’s manual.
    • Disconnect the electrical connector cable to the shutter assembly, see figure titled “Shutter Assembly Connections” in the operator’s manual. This is done to check the signal to the aiming beam diode without any load.
    • Connect a DVM to R24, reference to TP6 (GND).
    • Turn on system. Faults will come on because shutter assembly is disconnected, but they can be ignored for this test.
    • With the aiming beam switch in the off position, the DVM should be reading approximately 5 V. With the aiming beam switch in the on position the DVM should read approximately 0 V. If you get these readings then the turn on signal to the aiming beam diode is okay and the shutter assembly should be replaced using the procedures outlined in the operator’s manual. If you are not getting these measurements then go to the next step.
    • Verify that the turn on signal for the aiming beam is coming to the laser head board. Turn the aiming beam switch off. Turn the laser system off.
    • Connect a DVM to R20, reference to TP6 (GND).
    • Turn on the laser system. Faults will come on because the shutter assembly is disconnected, but they can be ignored for this test.
    • With the aiming beam switch in the off position, the DVM should be reading approximately 0 V. With the aiming beam switch in the on position, the DVM should be reading approximately 2.5 V. If you get these readings the turn on signal is okay up to the head board and the problem is somewhere on the head board. Replace the head board using the procedures outlined in the operator’s manual. If you are not getting these measurements, the power module may need to be replaced is you own a performance package. If you own a basic system the DDI box may need to be changed.
  4. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance

No Laser Output Beam

  1. Verify that the power module is on and ready light is on.
  2. If fault lights (red) are lit, clear faults.
  3. Open shutter and verify that the shutter open indicator is illuminatedNOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam. Replace power module, laser head, and/or RF cable if necessary depending on warning lights and troubleshooting results.
  4. Verify that there is modulation input. Set the remote to local modulation and run at 1000 µs period, 100 µs pulse width. If power meter/probe is available measure the output power at this setting. Consult the operator´s manual for typical output power at this setting for your laser model. Verify that the laser tube is actually receiving modulation by monitoring the sound coming from the laser head.
  5. If RF warning lights are on, troubleshoot as necessary.
  6. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

RF Warning Lights On

Related symptoms; VSWR light on, Duty Cycle light on, Forward light on, Reflected light on.

See Chapter titled “Maintenance and Troubleshooting” in the Operator’s Manual for definition of RF warning lights. (Note: Warning lights can come on due to transient conditions. Always first attempt to clear the warning lights using the Fault Reset switch on the front panel of the remote control unit.

  1. 1st Check - Duty cycle indicator on. Solve this and ignore any other warning indicators that are on. This warning light comes on for modulation signals that are greater than 60% duty cycle or more than 1 ms pulse width. Set to 60% to see if fault clears, if not, see step 5. If system is integrated, Coherent’s 60% duty cycle may correspond to Integrator’s 100%. If in doubt, check with system integrator to verify.
  2. 2nd Check - VSWR indicator on. This indicator will often light with the Forward and Reflected fault lights. Ignore Forward light if VSWR indicator is on. Most probable causes for illumination are the RF cable and/or the laser head. See which lights are on at < 10% duty cycle preferably at 1 kHz operation. If VSWR is still illuminated try replacing the RF cable (system off, facility power disabled), if fault doesn’t clear see step 5.
  3. 3rd Check - Forward warning indicator on. The most likely cause for this warning indicator is the RF amp. If the Reflected fault light is on, set system to ~ 10% duty cycle 1 kHz. If fault persists, power module may have failed, see step 5.
  4. 4th Check - Reflected indicator on.Operate the laser at 1 kHz and 10% duty cycle to see if this indicator stays on. Typical sources for this indicator are the RF cable, and/or the laser head. It can also be due to low RF power. Closely inspect the RF cable for sharp bends and damage to the exterior insulator. Replace the RF cable if necessary (system off, facility power disabled). A bad tube will also cause this indicator to light. If cable is ok, see step 5.
  5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Water Flow Light On

For complete information refer to the Chapter titled “Maintenance and Troubleshooting” of the Operator’s Manual.

Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter or oscilloscope.):

  1. Verify that all water hose connections are okay and not leaking.
  2. Verify that the water flow is in the correct direction.
  3. Verify with external flow meter that water flow is in excess of 1.5 gallons per minute (2.5 gpm for K-500).
  4. Check water screen on the laser head and hoses for blockage. If water screen is blocked, clean using the method in the operator’s manual.
  5. Using an oscilloscope, measure waveforms between TP5 and GND, and TP3 and GND. Waveform should be measured if flow sensor is working. If no signal, replace flow sensor using the method in the operator’s manual.
  6. Check calibration of water flow circuit. While measuring between TP4 and GND. Reduce the water flow to below 1 gallon per minute. TP4 should go to 5 V. Increase water flow to greater than 1.5 gallon per minute (2.5 gpm for K-500). TP4 should go to approx. 0 V. Adjust potentiometer R1 so that TP4 goes to 0 V when water flow is greater than 1.5 gallons per minute (2.5 gpm for K-500). If voltage does not change then replace the head board using the method in the operator’s manual.If light is still on, replace the head board.
  7. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

RF Warning Faults

Diamond OEM

RF warning signals should be measured while the laser is receiving a modulation signal. A connector needs to be built by the integrator to measure these signals. Connect three DB25 connectors in parallel for form a breakout connector. One of the connectors needs to be a male type and another needs to be a female type. The thid connector can be either male or famale.

Click here for Breakout Schematic

Click here for Breakout Connector

Click here for Breakout Connector Connected to RF Amp

Related symptoms; See chapter titled “Maintenance and Troubleshooting” in the Operator’s Manual for definition of RF warnings. (note: Warning faults can come on without problems in transient conditions.) See Operator’s Manual illustration titled, RF Amplifier Output Singals - Normal Operating Conditions.

Output Singals - Normal Operating Conditions. Indicated by a pulse waveform being present at pin 10 of the 25 pin connector. Normal indication is a DC or ground signal. Solve this and neglect any other warning indicators that are on. This warning light comes on for modulation signals that are greater than 60% duty cycle or more than 1 ms pulse width.

  1. 1st Check – Duty cycle indicator on. Indicated by a pulse waveform being present at pin 11 of the 25 pin connector. Normal indication is a DC or ground signal. Often will light with Forward and Reflected. Forget about Forward light if VSWR is on. Most probable causes are the RF cable and /or the laser head. See what faults are on at <10% duty cycle preferably at 1 kHz operation.
  2. 2nd Check – VSWR indicator on. Indicated by a DC or ground signal being present at pin 9 of the 25 pin connector. Normal indication is a pulse waveform. The most likely cause for this warning is the RF amp. The reflected faults can come on, if it does try at ~ 10% duty cycle 1 kHz. RF amp failures can still occur with no Forward indicator on.
  3. 3rd Check – Forward warning indicator on. Indicated by a pulse waveform being present at pin 8 of the 25 pin connector. Normal indication is a DC signal. Operate the laser at 1 kHz and 10% duty cycle to see if this indicator stays on. Typical sources for this indicator are the RF cable, and/or the Laser head. It can also be due to low RF power. Closely inspect the RF cable for sharp bends and damage to exterior insulator. Replace the RF cable if necessary. A bad tube will also cause this indicator.
  4. 4th Check – Reflected indicator on. 1-800-367-7890 or your local service representative for assistance.
  5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

No Laser Output Beam

Diamond OEM

  1. Perform checks for good DC voltage found in Laser System Doesn’t Turn On, troubleshoot as necessary.
  2. Verify that RF cable connections at the laser head and the RF amp, are okay, not burnt verify that the RF cable is not damaged. Replace cable if necessary. to verify that correct signals are being sent to the RF amp. Check user interface if following signals are not available or are noisy or don’t agree with what should be there. being sent and should not be noisy. 1-800-367-7890 or your local service representative for assistance.
  3. If DC voltage is okay. Disconnect 25 pin connector from RF amp. Click here for illustration. Using Oscilloscope, measure cable side
    1. Enable: This signal is located on pin 3 of 25 pin connector cable. It should go to logic low to turn on the RF amp.
    2. Modulation: This signal is located on pin 7 of the 25 pin connector. Pulse waveform should agree with what the user thinks is

  4. Can modulation signal be heard coming from laser head? If so and still no laser output, replace laser head.

  5. If no modulation sound from laser head, try replacing RF amp.

  6. Check RF Warning Faults, troubleshoot as necessary.

  7. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

Low Laser Power

Diamond OEM​

Related symptoms; laser output skips.

  1. Perform checks for No Laser Output Beam, troubleshoot as necessary.
  2. Check beam delivery optics for clipping or blockage.
  3. Check RF Warning Faults, troubleshoot as necessary. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at
  4. 1-800-367-7890 or your local service representative for assistance.

Laser System Shuts Down at High Power Setting

Diamond OEM

Related symptoms; Laser system won’t run above certain duty cycles. Laser system will shut down when modulation is turned on.

  1. Set modulation to 1 kHz 20% duty cycle. Increase modulation, if modulation shuts down at around 30% duty cycle. Replace the power module if you own a performance package. If you own a basic system, replace the DC power supply. 1-800-367-7890 or your local service representative for assistance.
  2. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

CO2 OEM Packages

The Diamond laser is a modular, RF excited, sealed-off industrial CO2 pulsed laser. The Diamond K-150/K-200/K-250/K-500 OEM system consists of a laser head, RF amplifier, and an RF cable. A DC power supply is required and can be supplied by Coherent.

Laser System Doesn’t Turn On

Related symptoms: When I turn laser system on nothing happens. Laser system drops out.

Background information: The laser system will not turn on if there is no 48 V from the DC power supply.

  1. Verify that there is proper line voltage to the 48 VDC power supply. See paragraph titled “Input Power Connections to DC Power Supply Option” in the Operator’s Manual.
  2. Verify that the line voltage is within the proper specifications for the DC power supply. For example, no excessive noise, and within proper voltage specification.
  3. Disconnect the DC power supply from the RF amp. Verify that 48 V is at the output of the DC power supply while disconnected. If not replace the DC.
  4. Reconnect the RF amp to the DC power supply. Verify that 48 V is at the input of the RF amp. If not replace the RF amp.
  5. Turn off the 48 V supply and disconnect the +48 V and RTN at the terminal strip. Verify that 48 V is available at the cable, reconnect and verify that 48 V is still at terminal strip. If not, there could be a short at the laser head. Contact Coherent for next step.
  6. Turn laser system on, apply modulation to laser. Measure voltage at the input of the RF amp. Insure that the 48 V is still available and has not dropped more than 2 V. If so, replace the DC power supply.
  7. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Laser System Shut Down at High Power Setting

Related symptoms; Laser system won’t run above certain duty cycles. Laser system will shut down when modulation is turned on.

  1. Set modulation to 1 kHz 20% duty cycle. Increase modulation, if modulation shuts down at around 30% duty cycle. Replace the power module if you own a performance package. If you own a basic system, replace the DC power supply.
  2. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Low Laser Power

Related symptoms; laser output skips.

  1. Perform checks for No Laser Output Beam, troubleshoot as necessary.
  2. Check beam delivery optics for clipping or blockage.
  3. Check RF Warning Faults, troubleshoot as necessary.
  4. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

No Laser Output Beam

  1. Perform checks for good DC voltage found in Laser System Doesn’t Turn On, troubleshoot as necessary.
  2. Verify that RF cable connections at the laser head and the RF amp, are okay, not burnt verify that the RF cable is not damaged. Replace cable if necessary.
  3. If DC voltage is okay. Disconnect 25 pin connector from RF amp. Click here for illustration. Using Oscilloscope, measure cable side to verify that correct signals are being sent to the RF amp. Check user interface if following signals are not available or are noisy or don’t agree with what should be there.
    • Enable: This signal is located on pin 3 of 25 pin connector cable. It should go to logic low to turn on the RF amp.
    • Modulation: This signal is located on pin 7 of the 25 pin connector. Pulse waveform should agree with what the user thinks is being sent and should not be noisy.

  4. Can modulation signal be heard coming from laser head? If so and still no laser output, replace laser head.
  5. If no modulation sound from laser head, try replacing RF amp.
  6. Check RF Warning Faults, troubleshoot as necessary.
  7. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

RF Warning Faults

RF warning signals should be measured while the laser is receiving a modulation signal. A connector needs to be built by the integrator to measure these signals. Connect three DB25 connectors in parallel for form a breakout connector. One of the connectors needs to be a male type and another needs to be a female type. The third connector can be either male or female.

Related symptoms; See chapter titled “Maintenance and Troubleshooting” in the Operator’s Manual for definition of RF warnings. (note: Warning faults can come on without problems in transient conditions.) See Operator’s Manual illustration titled, RF Amplifier Output Singals - Normal Operating Conditions.

  1. 1st Check – Duty cycle indicator on.Indicated by a pulse waveform being present at pin 10 of the 25 pin connector. Normal indication is a DC or ground signal. Solve this and neglect any other warning indicators that are on. This warning light comes on for modulation signals that are greater than 60% duty cycle or more than 1 ms pulse width.
  2. 2nd Check – VSWR indicator on. Indicated by a pulse waveform being present at pin 11 of the 25 pin connector. Normal indication is a DC or ground signal. Often will light with Forward and Reflected. Forget about Forward light if VSWR is on. Most probable causes are the RF cable and /or the laser head. See what faults are on at <10% duty cycle preferably at 1 kHz operation.
  3. 3rd Check – Forward warning indicator on. Indicated by a DC or ground signal being present at pin 9 of the 25 pin connector. Normal indication is a pulse waveform. The most likely cause for this warning is the RF amp. The reflected faults can come on, if it does try at ~ 10% duty cycle 1 kHz. RF amp failures can still occur with no Forward indicator on.
  4. 4th Check – Reflected indicator on. Indicated by a pulse waveform being present at pin 8 of the 25 pin connector. Normal indication is a DC signal. Operate the laser at 1 kHz and 10% duty cycle to see if this indicator stays on. Typical sources for this indicator are the RF cable, and/or the Laser head. It can also be due to low RF power. Closely inspect the RF cable for sharp bends and damage to exterior insulator. Replace the RF cable if necessary. A bad tube will also cause this indicator.
  5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

Water Flow Light On

Diamond Basic/PP

For complete information refer to the Chapter titled “Maintenance and Troubleshooting” of the Operator’s Manual.

Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter or oscilloscope.): manual. no signal, replace flow sensor using the method in the operator’s manual. Click here for illustration gallon per minute. TP4 should go to 5 V. Increase water flow to greater than 1.5 gallon per minute (2.5 gpm for K-500). TP4 should go to approx. 0 V. Adjust potentiometer R1 so that TP4 goes to 0 V when water flow is greater than 1.5 gallons per minute (2.5 gpm for K-500). If voltage does not change then replace the head board using the method in the operator’s manual. Click here for illustration 1-800-367-7890 or your local service representative for assistance.

  1. Verify that all water hose connections are okay and not leaking.
  2. Verify that the water flow is in the correct direction.
  3. Verify with external flow meter that water flow is in excess of 1.5 gallons per minute (2.5 gpm for K-500).
  4. Check water screen on the laser head and hoses for blockage. If water screen is blocked, clean using the method in the operator’s
  5. Using an oscilloscope, measure waveforms between TP5 and GND, and TP3 and GND. Waveform should be measured if flow sensor is working. If
  6. Check calibration of water flow circuit. While measuring between TP4 and GND. Reduce the water flow to below 1
  7. If light is still on, replace the head board.
  8. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

No Laser Output Beam

Diamond Basic/PP

  1. Verify that the power module is on and ready light is on. Click here for illustration
  2. If fault lights (red) are lit, clear faults. Click here for illustration
  3. Open shutter and verify that the shutter open indicator is illuminated NOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam. meter/probe is available measure the output power at this setting. Consult the operator´s manual for typical output power at this setting for your laser model. Verify that the laser tube is actually receiving modulation by monitoring the sound coming from the laser head.
  4. Verify that there is modulation input. Set the remote to local modulation and run at 1000 µs period, 100 µs pulse width. If power modulation by monitoring the sound coming from the laser head. Replace power module, laser head, and/or RF cable if necessary depending on warning lights and troubleshooting results. 1-800-367-7890 or your local service representative for assistance.
  5. If RF warning lights are on troubleshoot as necessary.
  6. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

RF Warning Lights On

Related symptoms; VSWR light on, Duty Cycle light on, Forward light on, Reflected light on.

See Chapter titled “Maintenance and Troubleshooting” in the Operator’s Manual for definition of RF warning lights. (Note: Warning lights can come on due to transient conditions. Always first attempt to clear the warning lights using the Fault Reset switch on the front panel of the remote control unit.)

  1. 1st Check - Duty cycle indicator on. Solve this and ignore any other warning indicators that are on. This warning light comes on for modulation signals that are greater than 60% duty cycle or more than 1 ms pulse width. Set to 60% to see if fault clears, if not, see step 5. If system is integrated, Coherent’s 60% duty cycle may correspond to Integrator’s 100%. If in doubt, check with system integrator to verify.
  2. 2nd Check - VSWR indicator on. This indicator will often light with the Forward and Reflected fault lights. Ignore Forward light if VSWR indicator is on. Most probable causes for illumination are the RF cable and/or the laser head. See which lights are on at < 10% duty cycle preferably at 1 kHz operation. If VSWR is still illuminated try replacing the RF cable (system off, facility power disabled), if fault doesn’t clear see step 5.
  3. 3rd Check - Forward warning indicator on. The most likely cause for this warning indicator is the RF amp. If the Reflected fault light is on, set system to ~ 10% duty cycle 1 kHz. If fault persists, power module may have failed, see step 5.
  4. 4th Check - Reflected indicator on. Operate the laser at 1 kHz and 10% duty cycle to see if this indicator stays on. Typical sources for this indicator are the RF cable, and/or the laser head. It can also be due to low RF power. Closely inspect the RF cable for sharp bends and damage to the exterior insulator. Replace the RF cable if necessary (system off, facility power disabled). A bad tube will also cause this indicator to light. If cable is ok, see step 5.
  5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.


Low Laser Power

Related symptoms; laser output skips.

  1. Check condition of all system beam delivery optics. These optics must be free of dirt, dust and smoke for full delivery of power to the work surface. Consult the system integrator for cleaning methods or replacement optics. This must be done before proceeding to next section. system is integrated, Coherent’s 60% duty cycle may correspond to Integrator’s 100%. If in doubt, check with system integrator to verify.
  2. Verify that modulation is input to laser at correct duty cycle. Click here for illustration If NOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam. width. If a power meter/probe is available measure the output power at this setting.
  3. Disconnect all external controls. Set the remote to local modulation and run at 1000 µs period, 600 µs pulse
Diamond Model Output power at 1000 µs pulse period and 600 µs pulse width
K-150 > 150 W
K-200 > 200 W
K-250 > 250 W
K-500 > 500 W



  • Check purge gas and purge gas filter, see the chapter titled “Utility Requirements and System Installation” in the Operator’s Manual for details. If RF warning lights are on troubleshoot as necessary. still not operating (please note the pulse width and pulse period for low power operation) contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.
  • Replace power module, laser head, and/or RF cable if necessary depending on warning lights and troubleshooting results.
  • If after verifying and/or correcting the checklist items the system is


  • Laser System Shuts Down at High Power Setting

    Diamond Basic/PP

    Related symptoms; Laser system won’t run above certain duty cycles. Laser system will shut down when modulation is turned on.

    1. Set modulation to 1 kHz 20% duty cycle. Increase modulation, if modulation shuts down at around 30% duty cycle. Replace the power module if you own a performance package. If you own a basic system, replace the DC power supply. 1-800-367-7890 or your local service representative for assistance.
    2. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

    Laser System Doesn't Turn On

    Diamond Basic/PP

    Related symptoms: When I turn the laser system on nothing happens.

    Background information: The laser system has an interlock circuit that the customer/integrator can interface to. This interlock circuit prevents the laser from turning on if a safety requirement is not met. The interlock circuit uses a 5 VDC power supply that turns on the main 48 VDC power supply when all of the interlocks, external and internal are properly connected. “Utility Requirements and System Installation”, paragraph titled “Changing Input Voltage for Power Module” in the Operator’s Manual. Click here for Performance Package illustration Click here for Basic Package illustration “Utility Requirements and System Installation”, table titled “Utility Requirements” in the Operator’s Manual for more information on input line voltage requirement.
    Basic troubleshooting:

    Performance Package troubleshooting:
    verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.

    1. Verify that the input voltage selector on the power module is set to the correct input line voltage for your facility. See Chapter titled
    2. If the laser system has external safety interlocks installed, verify that these interlocks are okay.
    3. Verify that the power module is connected to the input line voltage and that the input line voltage is ok. See Chapter titled
    4. Verify that all cables are connected properly. Click here for illustration.
    5. Verify that the interlock + connector (15 pin DB connector) is plugged into J11 on the remote control unit. Click here for illustration.
    6. Verify that all key switches are on. Click here for illustration
    1. Verify that the J7 user connector (9 pin DB connector) is plugged into the DDI box.
    1. Verify that the power module fuse is okay.
    2. Verify that the interlock connector (9 pin DB connector) is plugged into the power module. Click here for illustration
    3. Verify that the emergency stop switch is not pushed in. If after

    Head Thermal Light On

    Diamond Basic/PP

    Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter):

    1. Verify that the cooling water temperature is within specifications for your laser model as stated in the operator’s manual.
    2. Verify that the cooling water flow through the laser system is within the specifications for your laser model as stated in the operator’s manual. resistance between pins 6 and 12 at the connector. The acceptable value is 20 ohms when the shutter blade is less than 35ºC. on replace the headboard per the instructions in the operator’s manual; if light is still on replace the power module. 1-800-367-7890 or your local service representative for assistance.
    3. Check continuity of thermal switch located on the shutter blade. Disconnect the shutter cable from the shutter assembly. Measure the
    4. Place a Jumper between R9 and TP1 on the headboard. If the head thermal light goes off, then replace the shutter cable. If light stays
    5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support at

    Head Cover Light On

    Diamond Basic/PP

    1. Verify that the head cover is installed properly.
    2. If the light is still on remove the cover and install interlock defeat, which is shipped in the maintenance kit. If the indicator goes off when interlock defeat is installed, verify that the head cover and interlock pins are making contact. Clean contact area if necessary. still not operating contact Coherent Technical Support at 1-800-367-7890 or your local service representative for assistance.
    3. If light is still on replace the headboard per procedure in the operator’s manual.
    4. If after verifying and/or correcting the checklist items the system is

    CO2 Basic

    The Diamond laser series is a modular, RF excited, sealed industrial CO2 modulated laser. The Diamond K-150/K-200/K-250 Basic System consists of a laser head, RF amplifier, and Diamond digital interface (DDI).

    Several options are available for this Diamond system including:

    • Electrical shutter and aiming beam
    • Remote control unit for easy interface to controllers
    • DC power supply
    • Beam delivery hardware

    Heat Thermal Light On

    Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter):

    1. Verify that the cooling water temperature is within specifications for your laser model as stated in the operator’s manual.
    2. Verify that the cooling water flow through the laser system is within the specifications for your laser model as stated in the operator’s manual.
    3. Check continuity of thermal switch located on the shutter blade. Disconnect the shutter cable from the shutter assembly. Measure the resistance between pins 6 and 12 at the connector. The acceptable value is 20 ohms when the shutter blade is less than 35ºC.
    4. Place a Jumper between R9 and TP1 on the headboard. If the head thermal light goes off, then replace the shutter cable. If light stays on, replace the headboard per the instructions in the operator’s manual; if light is still on replace the power module.
    5. If the system is still not operating after verifying and/or correcting the checklist items, contact Coherent Technical Support or your local service representative for assistance.

    Head Cover Light On

    1. Verify that the head cover is installed properly.
    2. If the light is still on remove the cover and install interlock defeat, which is shipped in the maintenance kit. If the indicator goes off when interlock defeat is installed, verify that the head cover and interlock pins are making contact. Clean contact area if necessary.
    3. If light is still on, replace the headboard per procedure in the operator’s manual.
    4. If the system is still not operating after verifying and/or correcting the checklist items, contact Coherent Technical Support or your local service representative for assistance.

    Laser System Doesn’t Turn On

    Related symptoms: When I turn the laser system on nothing happens.

    Background information: The laser system has an interlock circuit that the customer/integrator can interface to. This interlock circuit prevents the laser from turning on if a safety requirement is not met. The interlock circuit uses a 5 VDC power supply that turns on the main 48 VDC power supply when all of the interlocks, external and internal are properly connected.

    1. Verify that the input voltage selector on the power module is set to the correct input line voltage for your facility. See Chapter titled, “Utility Requirements and System Installation”, and paragraph titled, “Changing Input Voltage for Power Module”, in the Operator’s Manual.
    2. If the laser system has external safety interlocks installed, verify that these interlocks are okay.
    3. Verify that the power module is connected to the input line voltage and that the input line voltage is okay. See Chapter titled, “Utility Requirements and System Installation”, and table titled, “Utility Requirements”, in the Operator’s Manual for more information on input line voltage requirement.
    4. Verify that all cables are connected properly.
    5. Verify that the interlock + connector (15 pin DB connector) is plugged into J11 on the remote control unit.
    6. Verify that all key switches are on.

    Basic troubleshooting:

    1. Verify that the J7 user connector (9 pin DB connector) is plugged into the DDI box.

    Performance Package troubleshooting:

    1. Verify that the power module fuse is okay.
    2. Verify that the interlock connector (9 pin DB connector) is plugged into the power module.
    3. Verify that the emergency stop switch is not pushed in. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

    Laser System Shuts Down at High Power Setting

    Related symptoms; Laser system won’t run above certain duty cycles. Laser system will shut down when modulation is turned on.

    1. Set modulation to 1 kHz 20% duty cycle. Increase modulation, if modulation shuts down at around 30% duty cycle. Replace the power module if you own a performance package. If you own a basic system, replace the DC power supply.
    2. If the system is still not operating after verifying and/or correcting the checklist items, contact Coherent Technical Support or your local service representative for assistance.

    Low Laser Power

    Related symptoms; laser output skips.

    1. Check condition of all system beam delivery optics. These optics must be free of dirt, dust and smoke for full delivery of power to the work surface. Consult the system integrator for cleaning methods or replacement optics. This must be done before proceeding to next section.
    2. Verify that modulation is input to laser at correct duty cycle.If system is integrated, Coherent’s 60% duty cycle may correspond to Integrator’s 100%. If in doubt, check with system integrator to verify. NOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam.
    3. Disconnect all external controls. Set the remote to local modulation and run at 1000 µs period, 600 µs pulse width. If a power meter/probe is available measure the output power at this setting. Check purge gas and purge gas filter, see the chapter titled, “Utility Requirements and System Installation”, in the Operator’s Manual for details. If RF warning lights are on troubleshoot as necessary.
    4. Replace power module, laser head, and/or RF cable if necessary depending on warning lights and troubleshooting results.
    5. If after verifying and/or correcting the checklist items the system is still not operating (please note the pulse width and pulse period for low power operation) contact Coherent Technical Support or your local service representative for assistance.

    No Aiming Beam

    Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter):

    1. Verify that aiming beam ON/OFF switch is ON.
    2. Verify shutter is closed; the aiming beam will only output if shutter is closed.
    3. If shutter is closed, verify that 5 VDC is available on the headboard. The green LED CR5 will be lit when 5 VDC is on. If no 5 VDC then replace the headboard. To verify that the correct signals are being sent to the aiming beam laser diode, use the following procedure.
      • Turn system off. Turn aiming beam switch on remote control off.
      • Remove the head cover, following procedures in the operator’s manual.
      • Bypass the head cover interlock, following procedures in the operator’s manual.
      • Disconnect the electrical connector cable to the shutter assembly, see figure titled “Shutter Assembly Connections” in the operator’s manual. This is done to check the signal to the aiming beam diode without any load.
      • Connect a DVM to R24, reference to TP6 (GND).
      • Turn on system. Faults will come on because shutter assembly is disconnected, but they can be ignored for this test.
      • With the aiming beam switch in the off position, the DVM should be reading approximately 5 V. With the aiming beam switch in the on position the DVM should read approximately 0 V. If you get these readings, then the turn on signal to the aiming beam diode is okay and the shutter assembly should be replaced using the procedures outlined in the operator’s manual. If you are not getting these measurements, go to the next step.
      • Verify that the turn on signal for the aiming beam is coming to the laser head board. Turn the aiming beam switch off. Turn the laser system off.
      • Connect a DVM to R20, reference to TP6 (GND).
      • Turn on the laser system. Faults will come on because the shutter assembly is disconnected, but they can be ignored for this test.
      • With the aiming beam switch in the off position, the DVM should be reading approximately 0 V. With the aiming beam switch in the on position, the DVM should be reading approximately 2.5 V. If you get these readings, the turn on signal is okay up to the head board and the problem is somewhere on the head board. Replace the head board using the procedures outlined in the operator’s manual. If you are not getting these measurements, the power module may need to be replaced is you own a performance package. If you own a basic system the DDI box may need to be changed.
    4. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance

    No Laser Output Beam

    1. Verify that the power module is on and ready light is on.
    2. If fault lights (red) are lit, clear faults.
    3. Open shutter and verify that the shutter open indicator is illuminated NOTE: The next step will attempt to operate the laser. A power meter or power probe is required to perform this step. Align power meter sensor using the aiming beam. Replace power module, laser head, and/or RF cable if necessary depending on warning lights and troubleshooting results.
    4. Verify that there is modulation input. Set the remote to local modulation and run at 1000 µs period, 100 µs pulse width. If power meter/probe is available, measure the output power at this setting. Consult the operator´s manual for typical output power at this setting for your laser model. Verify that the laser tube is actually receiving modulation by monitoring the sound coming from the laser head.
    5. If RF warning lights are on troubleshoot as necessary.
    6. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

    RF Warning Lights On

    Related symptoms; VSWR light on, Duty Cycle light on, Forward light on, Reflected light on.

    See Chapter titled “Maintenance and Troubleshooting” in the Operator’s Manual for definition of RF warning lights. (Note: Warning lights can come on due to transient conditions. Always first attempt to clear the warning lights using the Fault Reset switch on the front panel of the remote control unit.)

    1. 1st Check - Duty cycle indicator on.Solve this and ignore any other warning indicators that are on. This warning light comes on for modulation signals that are greater than 60% duty cycle or more than 1 ms pulse width. Set to 60% to see if fault clears, if not, see step 5. If system is integrated, Coherent’s 60% duty cycle may correspond to Integrator’s 100%. If in doubt, check with system integrator to verify.
    2. 2nd Check - VSWR indicator on. This indicator will often light with the Forward and Reflected fault lights. Ignore Forward light if VSWR indicator is on. Most probable causes for illumination are the RF cable and/or the laser head. See which lights are on at < 10% duty cycle preferably at 1 kHz operation. If VSWR is still illuminated try replacing the RF cable (system off, facility power disabled), if fault doesn’t clear see step 5.
    3. 3rd Check - Forward warning indicator on. The most likely cause for this warning indicator is the RF amp. If the Reflected fault light is on, set system to ~ 10% duty cycle 1 kHz. If fault persists, power module may have failed, see step 5.
    4. 4th Check - Reflected indicator on. Operate the laser at 1 kHz and 10% duty cycle to see if this indicator stays on. Typical sources for this indicator are the RF cable, and/or the laser head. It can also be due to low RF power. Closely inspect the RF cable for sharp bends and damage to the exterior insulator. Replace the RF cable if necessary (system off, facility power disabled). A bad tube will also cause this indicator to light. If cable is okay, see step 5.
    5. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

    Water Flow Light On

    For complete information refer to the Chapter titled, “Maintenance and Troubleshooting”, of the Operator’s Manual.

    Advanced troubleshooting section (requires knowledge of electronics measurement and digital volt meter or oscilloscope.):

    1. Verify that all water hose connections are okay and not leaking.
    2. Verify that the water flow is in the correct direction.
    3. Verify with external flow meter that water flow is in excess of 1.5 gallons per minute (2.5 gpm for K-500).
    4. Check water screen on the laser head and hoses for blockage. If water screen is blocked, clean using the method in the operator’s manual.
    5. Using an oscilloscope, measure waveforms between TP5 and GND, and TP3 and GND. Waveform should be measured if flow sensor is working. If no signal, replace flow sensor using the method in the operator’s manual.
    6. Check calibration of water flow circuit. While measuring between TP4 and GND. Reduce the water flow to below 1 gallon per minute. TP4 should go to 5 V. Increase water flow to greater than 1.5 gallon per minute (2.5 gpm for K-500). TP4 should go to approx. 0 V. Adjust potentiometer R1 so that TP4 goes to 0 V when water flow is greater than 1.5 gallons per minute (2.5 gpm for K-500). If voltage does not change then replace the head board using the method in the operator’s manual.
    7. If light is still on, replace the head board.
    8. If after verifying and/or correcting the checklist items the system is still not operating contact Coherent Technical Support or your local service representative for assistance.

    CO2 System Troubleshooting

    Coherent’s CO2 System troubleshooting information covers 3 models:

    • CO2 Basic - The Diamond laser series consists of a laser head, RF amplifier and Diamond digital interface
    • CO2 OEM Package
    • CO2 Performance Package - This Diamond laser series is a modular, RF excited, sealed industrial CO2 pulsed laser.

    Troubleshooting

    It is the mission of the Coherent Product Support Team to provide the real-time service expected from the leader in the laser industry. This section of our Service and Support site is to provide you with a complete array of service tools and information.


    Technical Support for Lasers

    Onsite Support

    Working closely with your personnel, Coherent Field Service Engineers attend to all aspects of system performance at your facility, including installations, service calls and preventive maintenance.

    To schedule a service visit, please contact your local service office.


    Video Playlists

    Click the upper left icon in each video to see the available playlist.

    Coherent’s Industrial Revolution In Ultrafast Science


    Coherent Industrial Lasers


    Lasers Cutters


    Lasers for Scientific & Life Sciences Applications


    Optical Safety

    Laser light, because of its special qualities, poses safety hazards not associated with light from conventional sources. The safe use of lasers requires all operators, and everyone near the laser system, to be aware of the dangers involved. Users must be familiar with the instrument and the properties of coherent, intense beams of light.

    The safety precautions listed below are to be read and observed by anyone working with or near the laser. At all times, ensure that all personnel who operate, maintain or service the laser are protected from accidental or unnecessary exposure to laser radiation exceeding the accessible emission limits listed in ‘Performance Standards for Laser Products,’ United States Code of Federal Regulations, 21CFR1040 10(d).

    The greatest concern when using a laser is eye safety. In addition to the main beam, there are often many smaller beams present at various angles near the laser system. These beams are formed by specular reflections of the main beam at polished surfaces such as lenses or beamsplitters. While weaker than the main beam, such beams may still be sufficiently intense to cause eye damage.

    Laser beams are powerful enough to burn skin, clothing or paint even at some distance. They can ignite volatile substances such as alcohol, gasoline, ether and other solvents, and can damage light-sensitive elements in video cameras, photomultipliers and photodiodes. The user is advised to follow the precautions below. specific emitted wavelengths and/or generated wavelengths. Laser eyewear suppliers areadvertised in Laser Focus World and Photonics Spectra Buyer’s Guide. Consult the ANSI, ACGIH, or OSHA standards for guidance. safety practices. When not in use, lasers should be shut down completely and made off-limits to unauthorized personnel. collimated over long distances and therefore presents a potential hazard if not confined. It is good practice to operate the laser in an enclosed room.

    1. Observe all safety precautions in the preinstallation and operator’s manuals.
    2. All personnel should wear laser safety eyewear rated to protect against the
    3. Avoid wearing watches, jewelry, or other objects that may reflect or scatter the laser beam.
    4. Stay aware of the laser beam path, particularly when external optics are used to steer the beam.
    5. Provide enclosures for beam paths whenever possible.
    6. Use appropriate energy-absorbing targets for beam blocking.
    7. Block the beam before applying tools such as Allen wrenches or ball drivers to external optics.
    8. Limit access to the laser to qualified users who are familiar with laser
    9. Terminate the laser beam with a light-absorbing material. Laser light can remain
    10. Post warning signs in the area of the laser to alert those present.
    11. Exercise extreme caution when using solvents in the area of the laser.
    12. Never look directly into the laser beam or at scattered laser light from any reflective surface. Never sight down the beam.
    13. Set up the laser so that the beam height is either well below or well above eye level.
    14. Avoid direct exposure to the laser light. Laser beams can easily cause flesh burns or may scorch clothing.
    15. Advise all those working with or near the laser of these precautions.

    Electrical Safety

    Most, if not all, Class 3R, 3B and Class 4 Lasers and Laser Systems utilize high-level AC and DC voltages in both the laser head and power supply. All Coherent laser systems are designed for operation with the laser head and power supply covers closed. Only trained personnel aware of the hazards involved should remove the protective covers.

    The following precautions must be observed by everyone.

    1. Disconnect main power lines before working on any electrical equipment.
    2. Do not short or ground the power supply output. Protection against possible hazards requires proper ground connection.
    3. Never work on electrical equipment unless there is another person nearby who is familiar with the system.
    4. When possible, keep one hand away from the equipment to reduce electrical current danger.
    5. Always use approved, insulated tools.
    6. Be aware of any special measurement techniques required.

    Classification Criteria

    The government recommended safety practices for a given laser system will depend on its classification. The following list highlights the criteria used to classify lasers, as well as listing the key safety considerations when operating a system within the indicated classification. See “See ANSI Z136.1 or IEC 60825-1” for a comprehensive discussion of these safety topics. average output power (watts) and limiting exposure time inherent in the design are considered. are considered.

    Laser Classification

    • Wavelength: If the laser is designed to emit multiple wavelengths the classification is based on the most hazardous wavelength.
    • Output Characteristics: For continuous-wave (CW) or repetitively pulsed lasers the
    • For pulsed lasers the total energy per pulse (joule), pulse duration, pulse repetition frequency and emergent beam radiant exposure

    Laser Classification
    These systems are also classified as “Exempt” lasers. They are normally not hazardous with respect to continuous viewing, or are designed in a way that prevents human access to laser radiation (e.g., laser printers).

    • Class 1 and 1M Lasers and Laser Systems printers). These lasers emit visible light, which, due to normal human reflex responses, do not present a hazard. However, a safety risk would be posed if the output source were brought to within close proximity of the eye and then viewed for an extended period of time.
    • Class 2 and 2M Lasers and Laser Systems (Low Risk) eye and then viewed for an extended period of time. Class III lasers can cause eye injury if viewed momentarily, but are not capable of causing serious skin injury or hazardous diffuse reflections without the use of collecting/conditioning optics (e.g., fiber optics, telescopes, etc.).
    • Class 3R and 3B Lasers and Laser Systems (Moderate Risk) telescopes, etc.). These lasers present an eye hazard from direct and diffuse reflections. In addition, class IV lasers can cause combustion of flammable materials and produce serious skin burns and injury from direct exposure. Most laser systems manufactured by Coherent fall into this classification.
    • Class 4 Lasers and Laser Systems (High Risk)

    Governing Laser Safety Standards

    Laser owners have the fundamental responsibility to provide for the safe use of lasers within their facility and to implement safety programs to adequately control the hazards associated with laser use. In the United States, the accepted governing standards are the ANSI Z136 series, The Safe Use of Lasers. Outside of the United States, international standards such as IEC 60825 series, Safety of Laser Products, prevail. We recommend for laser owners to follow the governing standard in their country to assure regulatory compliance and to provide the necessary safety programs to protect their employees and property. Other Laser Safety Sites

    Laser Institute of America
    www.laserinstitute.org

    The Laser Institute of America is a professional society that promotes laser safety and education by offering technical conferences, workshops, publications, and training to industrial, medical, research, and government communities. You can purchase the standards referenced above from their site.

    Center for Devices and Radiological Health
    www.fda.gov

    Center for Devices and Radiological Health (CDRH) regulates firms who manufacture, repackage, re-label, and/or import lasers (and medical devices) sold in the United States. An overview of laws and regulations
    for radiation-emitting products is provided on the web site.

    Students: After viewing the laser safety video, you must successfully complete the laser safety quiz prior to attending any of Coherent’s laser training programs.

    Important Notes: These videos are intended as a guide to laser safety and ESD awareness and must be viewed in their entirety.

    These videos are not a substitute for company-specific laser safety and ESD training. The laser safety exam and laser safety waiver shown in the laser safety video are for certification for the courses given by the Coherent Laser Training Program only.

    The laser safety video is based on ANSI Z136.1 for Safe Use of Lasers, and there may be additional or alternate training requirements for the user depending on the user’s experience, the potential laser hazards, and the prevailing regulatory requirements at the user’s location.

    Laser Safety Training Video
    Laser Safety Training Video (33:58)


    Students: After viewing the laser safety video, you must successfully complete the laser safety quiz prior to attending any of Coherent’s laser training programs.

    Important Notes: These videos are intended as a guide to laser safety and ESD awareness and must be viewed in their entirety.

    These videos are not a substitute for company-specific laser safety and ESD training. The laser safety exam and laser safety waiver shown in the laser safety video are for certification for the courses given by the Coherent Laser Training Program only.

    The laser safety video is based on ANSI Z136.1 for Safe Use of Lasers, and there may be additional or alternate training requirements for the user depending on the user’s experience, the potential laser hazards, and the prevailing regulatory requirements at the user’s location.


    Recommended Laser Eyewear Suppliers

    Recommended Laser Eyewear Suppliers

    Training Locations

    How do I get there?

    Coherent, Inc. - Santa Clara Laser Training Facility
    5100 Patrick Henry Drive
    Santa Clara, CA 95051

    Coherent GmbH. - Excimer Laser Training Facility
    Hans-Boeckler-Strasse 12, Werk 1
    D-37079 Gottingen, Germany

    Get Driving Directions to our facility from MapQuest.com
    www.mapquest.com

    Contact Information

    800 367-7890 Toll Free
    +1 408 764-4050 Telephone


    Instructors

    Our instructors have extensive knowledge and experience in their areas of product specialty. They have gained their expertise through formal education and by working in various fields, such as manufacturing, customer service and engineering. Each instructor creates a professional and comfortable environment that is ideal for learning.

    All courses include both lecture and lab time with the emphasis on hands-on learning and individualized attention. Class sizes are small, ensuring a generous amount of personal attention.


    Coherent Course Catalog

    To explore exactly what Coherent offers, download the latest version of the Coherent Laser Training Catalog, Description of Courses. In this booklet you will find complete course descriptions, key topics covered, and a list of prerequisites for each course. Additionally, you will find the information you will need to begin the registration process.

    Click on the image to download the course catalog.

    Did you find the course you wanted?

    There are some courses available that don’t appear on the training schedule. Coherent can also customize special courses to meet your specific training needs. Call Coherent at at (408) 764-4050 or send us an email if you would like to discuss this option.


    Coherent Course Catalog

    Coherent Course Catalog

    Cross Regional Support

    Submission of the form below begins the registration process for customers in need of support in countries outside the original location of purchase. This process enables us to increase transparency of service support entitlement and capabilities, and ultimately improve the level of support Coherent is able to provide.


    Repair and Calibration Shipping Addresses

    To prepare your instrument meter or sensor for return to Coherent, make a tag that includes the name and address of the owner, the contact individual, the serial number, and the RMA number you received from Coherent Customer Service. Attach this tag to the unit.

    Wrap the product with polyethylene sheeting or equivalent material. If the original packing material and carton are not available, use a corrugated cardboard shipping carton with inside dimensions at least 6 in. (15 cm) taller, wider, and deeper than the product. The shipping carton must be constructed of cardboard with a minimum 375 lbs. (170 kg) test strength. Cushion the instrument unit in the shipping carton with packing material or urethane foam on all sides between the carton and the instrument or probe sensor. Allow 3 in. (7.5 cm) clearance on all sides, top, and bottom. Seal the shipping carton with shipping tape or an industrial stapler.

    USA

    Coherent Laser Measurement and Control Service Center
    Attn: (your RMA number)
    27650 SW 95th Avenue
    Wilsonville, OR 97070

    Europe
    Coherent (Deutschland) GmbH
    Dieselstr. 5 b
    D-64807 Dieburg
    Germany

    Asia
    Coherent Japan
    Toyo MK Building
    7-2-14 Toyo
    Koto-Ku, Tokyo
    135-0016 Japan


    Obtaining Warranty Service

    In order to obtain service under this warranty, Customer must notify the Company of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. The Company shall, in its sole discretion, determine whether to perform warranty service at the Customer’s facility, at the Company’s facility or at an authorized repair station. If Customer is directed by the Company to ship the product to the Company or a repair station, Customer shall package the product (to protect from damage during shipping) and ship it to the address specified by the Company, shipping prepaid. The customer shall pay the cost of shipping the Product back to the Customer in conjunction with recalibration and recertification; the Company shall pay the cost of shipping the Product back to the Customer in conjunction with product failures within the first twelve months of time of sale or during an extended twelve month warranty period.

    A Returned Material Authorization number (RMA) assigned by the Company must be included on the outside of all shipping packages and containers. Items returned without an RMA number are subject to return to the sender.

    Location Phone Fax E-mail
    USA 800 343 4912 503 454 5727 LMC.sales@coherent.com
    Asia 813 5635 8680 813 5635 8681 LMC.sales@coherent.com
    Europe 49 6071 9680 49 6071 968499 LMC.sales@coherent.com

    Detailed instructions for preparing and shipping your instrument can be found here.


    Limitations

    The foregoing warranties shall not apply, and Coherent reserves the right to refuse warranty service, should malfunction or failure resultfrom:

    THIS WARRANTY IS EXCLUSIVE IN LIEU OF ALL OTHER WARRANTIES WHETHER WRITTEN, ORAL, OR IMPLIED. COHERENT SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE COMPANY BE LIABLE FOR ANY INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH ITS PRODUCTS.

    • Damage caused by improper installation, handling or use.
    • Laser damage (including sensor elements damaged beyond repair).
    • Failure to follow recommended maintenance procedures.
    • Unauthorized product modification or repair.
    • Operation outside the environmental specifications of the product.
    • Coherent assumes no liability for Customer-supplied material returned with Products for warranty service or recalibration.

    Extended Lifetime Warranty*

    Coherent, Inc. offers original purchasers purchasing qualified laser power and energy meters and sensors products an extended twelve (12) month warranty program, which includes all parts and labor. In order to qualify for this warranty, a Customer must return the Product to the Company for recalibration and recertification. The Company will recertify the Product, provide software upgrades, and perform any needed repairs, and recalibrate the Product, for a fixed service fee (as established by the Company from time to time and in effect at the time of service). If the product cannot be recertified due to damage beyond repair, parts obsolescence, or other reasons, the Customer may be informed that an Extended Warranty program is not available for the Product.

    If the Product fails and is returned to the Company within one year following the date of recalibration and recertification service, the Company will, at its option, repair or replace the Product or any component found to be defective. If the Product must be replaced and the Product is no longer available for sale, Coherent reserves the right to replace with an equivalent or better Product. This warranty applies only to the original purchaser and is not transferable.

    *Not applicable to all products.


    Limited Warranty

    Terms & Conditions

    Coherent provides web technical assistance as a service to its customers and assumes no liability thereby for any injury or damage that may occur contemporaneous with such services.

    These support services do not affect, under any circumstances, the terms of any warranty agreement between Coherent and the buyer. The procedures that follow may require that the laser system be operated with one or more interlocks defeated and/or protective covers open or removed. This may expose the operator to potentially hazardous visible and invisible radiation. Laser housings should only be opened, or removed, by trained personnel cognizant of the hazards involved. Safety glasses, appropriate for the wavelengths being produced by the laser system, should always be worn during servicing and operation.

    It is the responsibility of the laser purchaser to ensure that laser safety policies and practices are in place, that training on these policies and practices has been provided to all operators and maintenance personnel, and that these policies and practices are adhered to during the maintenance and operation of the laser system. Operation of any Coherent laser with any of its interlocks defeated is always at the operator’s own risk.

    The documents contained on this site are copyrighted with all rights reserved. Under the copyright laws, these documents may not be copied in whole or in part or reproduced in any other media without the express written permission of Coherent, Inc. Permitted copies must carry the same proprietary and copyright notices as were affixed to the original. This exception does not allow copies to be made for others, whether or not sold, but all the material purchased may be sold, given or loaned to another person. Under the law, copying includes translation into another language.

    Coherent and the Coherent Logo are registered trademarks of Coherent, Inc. Every effort has been made to ensure the accuracy of the data given on this site. The information, figures, tables, specifications and schematics contained herein are subject to change without notice. Coherent makes no warranty or representation, either expressed or implied, with respect to these documents. In no event will Coherent be liable for any direct, indirect, special, incidental or consequential damages resulting from any defects in its documentation.

    Warranty Information for Lasers

    All electronic and mechanical parts are warranted against defects in materials and workmanship, under normal use, for a twelve (12) month warranty period. The obligation of Coherent is limited to repairing or replacing equipment that proves to be defective during the warranty period without charge. Warranties do not cover damages due to misuse, negligence, or accidents due to installations, repairs or adjustments not specifically authorized by a certified Coherent engineer. Coherent, Inc. will, at its option, repair or replace any product or component found to be defective during the warranty period. This warranty applies only to the original purchaser and is not transferable.

    Contact Information for regional offices:

    AMERICAS: (800) 527-3786; (408) 764-4983; tech.sales@coherent.com

    EUROPE: +49 (6071) 968-333; sales.germany@coherent.com

    JAPAN: +81 (3) 5635-8700; sales.tokyo@coherent.com

    CHINA: +86 (10) 8215-3600; sales.china@coherent.com

    TAIWAN: +88 (6) 3505 2920; twn.customer.support@coherent.com


    Terms and Conditions of Sale - North America

    Terms and Conditions of Sale - South Korea

    Terms and Conditions of Sale - Canada

    Terms and Conditions of Sale - China

    Terms and Conditions of Sale - Taiwan

    Terms and Conditions of Sale - Japan

    Terms and Conditions of Sale - Singapore

    Terms and Conditions of Sale - Asia

    Extended Warranty for Eligible Power and Energy Products

    Product Description Part Number Product Description Part Number
    BeamFinder 1098427 PM150-19A 1098510
    EnergyMax-RS J-10MB-HE Energy Sensor 1191429 PM150-19B 1098415
    EnergyMax-RS J-10MB-1531 Energy Sensor 1231479 PM150-19C 1098412
    EnergyMax-RS J-10MB-LE Energy Sensor 1191428 PM150-50 1098398
    EnergyMax-RS J-10SI-HE Energy Sensor 1191427 PM150-50A 1098510
    EnergyMax-RS J-25MB-LE Energy Sensor 1191431 PM150-50B 1098415
    EnergyMax-RS J-50MB-HE Energy Sensor 1191432 PM150-50C 1098412
    EnergyMax-RS J-50MB-YAG Energy Sensor 1191430 PM150-50XB 1098441
    1219962 EnergyMax-RS J-50MB-YAG-1535 Energy Sensor 1219962 PM150-50XC 1098443
    EnergyMax-RS J-50MT-10KHZ Energy Sensor 1191433 PM200F-19 1098480
    EnergyMax-USB J-10MB-HE Energy Sensor 1191436 PM200F-50 1098472
    EnergyMax-USB J-10MB-LE Energy Sensor 1191435 PM200F-50X 1113493
    EnergyMax-USB J-10MT-10KHZ Energy Sensor 1191445 PM300 1141474
    EnergyMax-USB J-10SI-HE Energy Sensor 1191434 PM300F-19 1098509
    EnergyMax-USB J-25MB-HE Energy Sensor 1191442 PM300F-50 1098417
    EnergyMax-USB J-50MB-IR Energy Sensor 1191440 PM300F-50X 1098481
    EnergyMax-USB J-25MB-1511 Energy Sensor 1213190 PM1K 1098392
    EnergyMax-USB J-25MB-LE Energy Sensor 1191441 PM1K-100 1098490
    EnergyMax-USB J-25MT-10KHZ Energy Sensor 1191446 PM1K-36B 1098333
    EnergyMax-USB J-25MUV-193 Energy Sensor 1191448 PM3K 1098462
    EnergyMax-USB J-50MB-HE Energy Sensor 1191444 PM3K-100 1098506
    EnergyMax-USB J-50MB-LE Energy Sensor 1191443 PM3Q 1098419
    EnergyMax-USB J-50MB-YAG Energy Sensor 1191437 PM5K 1098454
    EnergyMax-USB J-50MB-YAG-1535 Energy Sensor 1191438 PM5K-100 1098461
    EnergyMax-USB J-50MB-YAG-1528 Energy Sensor 1191439 PM5K-200 1098505
    EnergyMax-USB J-50MT-10KHz-1571 Energy Sensor 1208286 PowerMax RS - LM-10 Power Sensor 1168341
    EnergyMax-USB J-50MT-10KHZ Energy Sensor 1191447 PowerMax RS - LM-45 Power Sensor 1211474
    EnergyMax-USB J-50MUV-248 with Diffuser Energy Sensor 1191449 PowerMax RS - LM-150LS Power Sensor 1212246
    FieldMate 1098297 PowerMax RS - LM-200 110V Power Sensor 1258401
    FieldMaxII-P 1098581 PowerMax RS - LM-1000 Power Sensor 1180872
    FieldMaxII-TO 1098579 PowerMax RS - LM-5000 Power Sensor 1181653
    FieldMaxII-TOP 1098580 PowerMax-RS PM10-19C Power Sensor 1168345
    J-10MB-HE 1110843 PowerMax-RS PS19Q Power Sensor 1179504
    J-10MB-LE 1110855 PowerMax-RS PM30 Power Sensor 1174258
    J-10MT-10KHZ 1110856 PowerMax RS - PM30X Power Sensor 1174259
    J-25MB-HE 1110746 PowerMax-RS PM150-19C Power Sensor 1168347
    J-25MB-IR 1110577 PowerMax-RS PM150-50C Power Sensor 1168349
    J-25MB-LE 1110743 PowerMax-RS PM1K-36C Power Sensor 1174267
    J-25MT-10KHZ 1110747 PowerMax RS - PM1KX-100 Power Sensor 1214871
    J-25MUV-193 1110741 PowerMax RS - PM2X Power Sensor 1230323
    J-25MUV-248 1110745 PowerMax-RS PM3K Power Sensor 1191293
    J-50MB-HE 1110573 PowerMax USB - Beam Finder 1233118
    J-50MB-LE 1110576 PowerMax USB - LM-3 Power Sensor 1168339
    J-50MB-YAG 1110744 PowerMax-USB - LM-10 Power Sensor 1168340
    J-50MT-10KHZ 1110574 PowerMax-USB - LM-20 Power Sensor 1174270
    J-50MUV-193 1110575 PowerMax-USB - LM-45 Power Sensor 1168342
    J-50MUV-248 1110572 PowerMax USB - LM-100 Power Sensor 1193300
    J-Power 1132205 PowerMax USB - LM-150LS Power Sensor 1275678
    LabMax-TO 1104619 PowerMax USB - LM-200B Power Sensor 1194641
    LabMax-TOP 1104622 PowerMax-USB LM-200 110V Power Sensor 1193407
    LabMax-TOP w/GPIB 1104620 PowerMax-USB LM-200 220V Power Sensor 1195840
    LaserCheck 1098293 PowerMax-USB - LM-1000 Power Sensor 1174268
    LM-2 IR 1098342 PowerMax-USB LM-5000 Power Sensor 1174269
    LM-2 UV 1098390 PowerMax-USB PM2 Power Sensor 1174264
    LM-2 VIS 1098298 PowerMax USB - PM2X Power Sensor 1257617
    LM-3 HTD 1098328 PowerMax-USB PM3 Power Sensor 1174263
    LM-10 HTD 1098304 PowerMax USB - PM3K Power Sensor 1276824
    LM-45 HTD 1098320 PowerMax-USB PM3Q Power Sensor 1191133
    LM-100 HTD 1098346 PowerMax-USB PM10 Power Sensor 1174262
    LM-1000 1098409 PowerMax-USB PM10-19C Power Sensor 1168344
    LM-2500 1098437 PowerMax-USB PM30 Power Sensor 1174257
    LM-5000 1098421 PowerMax USB - PM30X Power Sensor 1263294
    OP-2 IR 1098416 PowerMax USB - PM150-50 Power Sensor 1223336
    OP-2 UV 1098401 PowerMax-USB PM150-19C Power Sensor 1168346
    OP-2 VIS 1098313 PowerMax-USB PM150-50C Power Sensor Sensor 1168348
    PM2 1098329 PowerMax USB - PM1K Power Sensor 1232163
    PM3Q 1098419 PowerMax-USB PM1K-36C Power Sensor 1174266
    PM10 1098338 PowerMax USB - PM5K-100 Power Sensor 1235755
    PM10-19A 1098423 PowerMax-USB PS10 Power Sensor 1174260
    PM10-19B 1098407 PowerMax-USB PS19 Power Sensor 1174261
    PM10-19C 1098455 PowerMax-USB PS19Q Power Sensor 1168343
    PM10V1 1098418 PowerMax-USB UV/VIS Quantum Power Sensors 1168337
    PM10X 1098321 PowerMax USB - Wand UV/VIS Quantum Power Sensor 1212310
    PM30V1 1098429 PS10 1098350
    PM30X 1098498 PS10Q 1098400
    PM150 1098444 PS19 1098413
    PM150X 1098398 PS19Q 1098341

    Technical Support

    Many of Coherent’s meters and sensors service items include both calibration and minor repairs. This means that in addition to calibration, Coherent will replace damaged components and re-certify the product as able to perform to the same specifications as when it was new. In addition, eligible products receive an extended 12 month warranty following re-certification. This is the same 12 month warranty Coherent offers with a new product.

    A large percentage calibrations are performed within five business days, and expedited service is available, to minimize customer downtime.

    Location Phone Email
    USA 800 343 4912 lmc.sales@coherent.com
    Asia 813 5635 8680 lmc.sales@coherent.com
    Europe 49 6071 9680 lmc.sales@coherent.com


    Please have the following information available:

    • Model Number
    • Serial Number
    • Purchase Order Number

    How long will it take?

    After receiving the item to be serviced and following customer approval to proceed with the work, Coherent is typically able to ship your product back within five working days. Some products take longer, and many products are turned around faster than this. Expedited service, including 24-hour service, is available for an additional charge.


    Facilities & Capabilities

    As the world’s largest laser manufacturer, Coherent calibration facilities contain the widest possible range of light sources from 193 nm to 10,600 nm, with powers ranging nanowatts to kilowatts.

    Coherent’s investment in service and calibration facilities and personnel is an on-going process, and we strive to maintain our unique technological edge. Our Quality Management System is registered to ISO 9001:2000; our products are NIST-traceable; and our calibration labs are ANSI-Z540-compliant.

    In addition, Coherent team delivers the industry’s best service, with a knowledgeable and responsive staff, and rapid turnaround.


    ISO 17025:2005 Accredited

    Coherent’s Wilsonville, Oregon; Dieburg, Germany; and Tokyo, Japan calibration laboratory is fully accredited to ISO/IEC 17025:2005 by ANAB, a brand of the ANSI-ASQ National Accreditation Board and recognized internationally by ILAC, APLAC, and IAAC. Certification to ISO 17025 is a formal recognition that a calibration laboratory is using valid and appropriate methods and is competent to carry out specified tests or calibrations.

    Scope of Accreditation

    The scope of accreditation applies to the laser/electrical calibration of nearly all the company’s catalog pyroelectric laser energy sensors, thermopile laser power sensors and meter electronics. The formal scope of accreditation can be found within the ANAB website at http://www.anab.org. Click the “Search Accredited Organizations” button on their homepage or click here to download the scope directly.

    ISO 17025 governs a laboratory’s quality management system, such as auditing and corrective action processes, and requires adherence to rigorous technical requirements.


    Technical Requirements

    In terms of technical requirements, ISO/IEC 17025 ensures that a company maintains testing facilities and equipment to specified standards ensures protocols are fully documented trains workers to an appropriate level of competence confirms validity and appropriateness of methods, especially so-called “non-standard” methods such as those used to calibrate laser measurement equipment, which have been developed internally uses accepted mathematical methods for calculating results verifies that purchased test equipment meets proper requirements and that all equipment used to produce accredited calibrations has itself received ISO 17025 accredited calibrations has a traceable path of calibration to independently maintained national or international standards provides both as received and outgoing testing data to customers in an approved format ensures the calibration certificate meets the requirements of the standard The outcome of all these efforts is that customers can have confidence that a laboratory achieves verifiable correct results and that these results will be reported in an unambiguous manner.


    ISO 17025:2005 Certificate & Scope – Wilsonville, Dieburg & Tokyo LMC

    Coherent ISO 17025:2005 Certificate & Scope

    Understanding ISO 17025 for Laser Power and Energy Measurement

    White Paper: Understanding ISO 17025 for Laser Power and Energy Measurement


    Laser Machine Tool FAQs

    1. What is a laser?

    Everything in the universe is made up of atoms. Atoms are constantly in motion, but can be in different states of excitation. If a lot of energy is applied to an atom, it can leave what is called the ground-state energy level and go to an excited level. The level of excitation depends on the amount of energy that is applied to the atom via heat, light, or electricity. Once an electron moves to a higher-energy level, it will eventually return to the ground state. When it does, it releases its energy as a photon—a particle of light. A laser is a device that controls the way energized atoms release photons. “Laser” is actually an acronym for light amplification by stimulated emission of radiation.

    2. How does laser cutting work?

    Industrial laser cutting concentrates high amounts of energy into a small, well-defined spot. The resulting heat energy created by the laser vaporizes materials in this small-defined area and a gas, or mixture of gases, such as oxygen, CO2, nitrogen, and/or helium is used to blow the vaporized material out of the kerf (the width of a groove made by the laser beam). The beam’s energy is applied directly where it is needed, minimizing the Heat Affected Zone (HAZ) surrounding the area being cut.

    3. What is the difference between CO2, fiber and YAG lasers?

    While there are many different types of lasers, at this time there are really only a few families of lasers that have the efficiency and output power to perform large-scale material processing: CO2, Fiber, and YAG Lasers. CO2 lasers are gas lasers that use carbon dioxide as the lasing medium. Fiber and YAG’s are solid-state lasers that use elements like Neodymium (Nd), Erbium (Er) and Ytterbium (Yb) diffused in a crystal of Yttrium-Aluminum-Garnet (YAG) or glass (in the case of Fiber) as the lasing medium.

    Coherent uses a range of powerful sealed CO2 lasers that emit far-infrared light at a wavelength of 10.6 microns. This wavelength is highly effective in processing a wide range of materials including wood, paper, plastics, glass, textiles, rubber and metals.

    Fiber and YAG emit near 1.06 microns and are well suited for processing metals, especially high reflectivity metals like copper, brass and aluminum. Plastic or organic materials cannot be processed with this wavelength.

    4. Is the laser sealed or gas flow-through?

    The laser used in our laser cutting machines is a sealed CO2 laser. Sealed lasers feature slab-discharge technology, which permanently confines the lasing gas mixture between two rectangular plate electrodes. These lasers require no replacement gas and no scheduled maintenance to the laser head for up to 25,000 hours of continuous operation. Consequently, sealed lasers eliminate maintenance downtime, thereby increasing productivity and reducing costs. Sealed lasers keep the beam path away from contaminants, ensuring a steady beam alignment and eliminating the need for cleaning.

    Sealed lasers also have lower electrical and cooling-water requirements than flow-through lasers that flow consumable gases through the laser head. The combination of these features results in an hourly operating cost of well under one dollar. By comparison, the hourly operating cost of flow-through lasers can be five to ten times higher.

    5. Is beam alignment a problem I have to worry about?

    Because we use a sealed laser, the beam path is concealed from contaminants and does not have to be taken apart to be cleaned, unlike lower end lasers where the beam path is exposed. This helps keep a steady beam alignment. Our machines are also very stable. After the initial installation, the laser cutting machine should not ever require a beam alignment. Other companies do not provide laser cutting machines that are as robust as Coherent’s, and these may lose their positioning over time.

    6. Does your laser burn materials?

    No. The laser vaporizes materials to cut it. This process should go as quickly as possible, to minimize heat being imparted to the material near the cut. Lasers that don’t vaporize quickly will take longer to cut through an area, resulting in more heat which causes burning. The lasers used in our machines have an extremely high peak power so parts are vaporized much faster, with higher edge quality. Lower watt lasers can’t accomplish this quality because they cut too slowly, and burning is more likely to take place.

    7. What laser power is right for my application?

    There are a variety of considerations when selecting the right laser power for your application.

    It is important to note that Coherent uses pulsed lasers that pulse ON/OFF thousands of times each second. The laser powers indicated are an Average with pulse ON power being three or more times the average. It is the Peak Pulse ON power that does the cutting. On many materials a higher Peak Pulse ON will result in quicker vaporization of material and a cleaner cut with less heat being imparted to the material near the cut. In laser cutting terms, high Peak Pulse power results in less Heat Affected Zone (HAZ) damage.

    It is important to note that Coherent uses pulsed lasers that pulse ON/OFF thousands of times each second. The laser powers indicated are an Average with pulse ON power being three or more times the average. It is the Peak Pulse ON power that does the cutting. On many materials a higher Peak Pulse ON will result in quicker vaporization of material and a cleaner cut with less heat being imparted to the material near the cut. In laser cutting terms, high Peak Pulse power results in less Heat Affected Zone (HAZ) damage.
    Thin materials, for example most plastics, fabrics and wood up to .040” can be cut at full speed (600” to 1200” per minute) by a 150 Watt average power laser. As materials get thicker, the machine can become power limited resulting in slower processing speeds. The user must then make a determination between increased throughput to be gained by increased laser power and increased cost of machine. Generally, the improvement in process speed is proportional with laser power.

    Safety 1. What is the safety class of the machine (I, II, III, or IV)?

    Class I is the safest type of laser machine, with a fully enclosed cutting area. All doors and covers have redundant safety interlocks that, when doors are opened, turn off power to the laser and place a shutter over the laser beam path. No eye protection or personal safety equipment is required when using this machine. Coherent laser cutting machines are Class I laser systems.

    Class IV is an open machine, so safety equipment must be used in the laser hazard area. When a 4’ x 8’ extension table is added to a laser cutting machine, then our system goes from Class I to Class IV. The machine must be open to allow the pass through of the cutting bed.
    When used according to regulations, the standard Class I enclosure prevents any exposure to the laser beam. You do not even have to wear eye protection when operating the machine.
    The standard Class I enclosure is safety interlocked preventing any exposure to the laser beam, fully complying with 21 CFR Chapter 1, Subchapter J. The machine is so safe that no eye protection need be worn when operating the machine. All motors are completely disengaged when the safety cover is open for mechanical safety.

    2. Could a laser beam hurt or blind me?3. Is it safe to use a laser?

    Although Class I means there is little to no possibility of being injured by a laser beam, it is still necessary to take common sense safety precautions. For example, some materials create harmful gasses when laser cut. Other materials may be flammable if correct process techniques are not used. It is important to determine material safety by acquiring a Material Safety Data Sheet (MSDS) from material suppliers. Some materials may require a fume filtration machine and dust collector. Check with Coherent or the material supplier before cutting any questionable materials.
    Yes. A dual exhaust machine provides efficient removal of cutting fumes. The vacuum cutting bed provides material hold-down and removes smoke from through-cutting. An additional top exhaust port removes residual smoke from engraving.

    4. Does the machine have adequate ventilation?

    Many of our customers simply vent outside, but check the Material Safety Data Sheet (MSDS) for its particular properties. Some materials may require a fume filtration machine and dust collector. Check with Coherent or the material supplier before cutting any questionable materials.

    Cutting Methods

    1. How do I determine which cutting method to use?

    In order to determine the best cutting method for your process, conduct a careful examination of your production needs. All cutting methods have their advantages and disadvantages. Typical criteria used for most process evaluations should include the following:
    2. What are the advantages of using a laser cutting machine?

    • Material To Be Processed
    • Range of Material Thickness
    • Accuracy Required
    • Material Finish Required
    • Production Rate Desired
    • Cost of Technology
    • Operating Costs
    • Operator Skill Requirements

    There are many reasons to choose a laser cutting machine. There is almost no limit to the cutting path of a laser—the point can move in any direction. This means that very complex designs can easily be performed without expensive tooling costs or long lead times. Small diameter holes that cannot be made with other machining processes can easily and quickly be performed with a laser. The process is non-contact and non-force, allowing very fragile parts to be cut with little or no support, and the part keeps its original shape from start to finish. Lasers can cut at very high speeds. Lasers do not have parts that will dull and need to be replaced, or that can break easily. Lasers allow you to cut a wide range of materials, and produce a high quality cut without requiring secondary processes. Laser cutting is a very cost effective process with low operating and maintenance costs and maximum flexibility.

    3. How does a laser compare to a router?

    In general, routers provide a low cost method for a variety of capabilities. Face milling on a router produces a smooth, clean finish. A router offers strong drilling performance, and is good for cutting thick plate, or several thin sheets of material clamped together.

    However, with a router you need to find a way to hold down the material. Our products have a vacuum cutting bed that provides material hold-down. A router needs to be sharpened and replaced over time, while the laser is “permanently sharp.” With a router, variations will also occur as the blade gets duller while cutting, and parts are limited in the complexity of the design. With lasers, the focused area is very small, so detail is vastly greater-—anything you can draw, you can cut. Routers are also unsafe due to small pieces that can fly loose, while our machines are enclosed and have a powerful vacuum bed that captures small pieces. Finally, routers are very noisy (to the point where safety equipment must be worn), but that is not the case with lasers.

    4. How does a laser compare to a steel rule die?

    In terms of dies, the cost of the tooling in a steel rule die is one of the lowest in all die technologies. The blades can also be changed easily, relative to other dies, when necessary. It takes 3 to 5 days to have the dies made, which is short compared to other die technologies, but tremendously long compared to laser cutting machines, where cutting is instantaneous.

    Dies are great when accuracy is not required, such as for boxes or garments. Overall, however, there is a major lack of accuracy and fine detail. Designs are limited to complexity—the more complex the part, the more it will cost to produce and the longer it will take. Large dies are even more expensive, and the lead time even greater. In some circumstances, especially for short-runs, the job may not even be worth the costs. Lasers, on the other hand, have a very small focus, so you are not at all limited by design or size—anything you can draw can be cut quickly and accurately. If any changes need to occur to the design, dies are difficult and expensive to change—it needs to be completely retooled. With a laser cutting machine, you need only make the changes to your design and save them to your file. This makes it easy, cost-effective, and efficient to make modifications with a laser.

    Dies wear out and have to be sharpened, while lasers do not encounter this problem. You will also require a lot of space to store the dies for your customers. The only space you need for your laser machine is for the machine itself. Finally, though it is possible to kiss-cut parts with dies, it is much more difficult and less accurate than with laser cutting.

    5. How does a laser compare to water jets?

    Water jet cutting works well for certain types of materials, such as titanium, granite, marble, concrete, and stone. Cut edges are clean with minimal burr. Problems encountered with other methods, such as crystallization, hardening, and reduced machine- or weld-abilities, are eliminated. Parts remain flat and there is no tooling to design or modify. Costs associated with secondary processes also do not exist.

    In general, however, a water jet has lower precision than a laser because the focus is larger and it cannot get the same level of detail that a laser can. Many materials cannot be cut by a water jet because they will shred or flutter. There are also lots of problems associated with the disposal of the abrasives used in the water jet, problems which do not exist for a laser cutting machine. The nozzles and parts wear out quickly, which leads to variations in the cut, as well as higher expenses for replacement components. With lasers, there are no parts to wear or break over time. Water jets tend to move fairly slowly, while a laser is typically much faster. Finally, your parts get wet with a water jet. It is very messy, noisy, and humid. Obviously, with a laser, your parts do not get wet, and the process is much cleaner with less inconveniences.

    6. How does a laser compare to Electrical Discharge Machining (EDM)/wire cutting?

    EDM allows for cutting complex shapes and thin walled configurations without distortion. EDM is suitable for materials considered too hard or where adhesion is a problem for traditional machining, and for materials typically machined by grinding. EDM can replace many types of contour grinding operations and eliminate secondary operations such as deburring and polishing.

    In general, however, EDM is really only suited for metal cutting. Laser cutting machines, on the other hand, can be used for a wide variety of applications and materials. EDMs can cut really thick, hard metals, including steels with hardness above Rc 38. If that is your main application, then this process may be suitable for you. Otherwise, you will find the machine is very slow and fairly limited in its capabilities. There are also parts to replace, such as when a wire breaks, which can slow down production and increase costs. This problem will not be encountered with a laser cutting machine.

    7. How does a laser compare to knife cutters?

    Knife cutting machines have been designed to process a variety of materials including technical textiles, industrial fabrics, paper, corrugated materials and more. These machines can be equipped with a range of tool heads for total cutting, kiss-cutting, creasing, routing, milling, drilling, etc. They have the ability to produce prototypes and samples rapidly.

    In general, however, knife cutters encounter problems with material hold-down. Our products have vacuum cutting beds which provide material hold-down. Knives also dull over time, so parts have to be replaced. This causes issues with variations in your part due to dulling. Lasers do not have any parts that can wear or dull, so these parts do not have to be replaced and accuracy is maintained throughout the entire cut. Also, knives can’t cut very thick materials. It is best used for thin sheet metal cutting. Otherwise, you will experience limitations in cutting that are not found with laser cutting machines. A laser can also easily cut hard plastics with adhesive backs that gum-up knife cutters.

    Functionality

    1. How easy is the machine to operate?

    The machine controls are easy to use and require little specialized training. An LCD display provides information about the file to be cut and allows editing of the laser settings. Additional buttons allow the user to move the cutting head, raising and lowering the bed, controlling the exhaust machine and regulating the gas pressure. The user can select a job file from the control panel that resides on any PC networked to the machine through our DNC software.

    2. What materials can the laser cut?

    The ability to cut a broad spectrum of materials is one of the strongest attributes of the laser. It is generally more cost effective than conventional cutting since it is faster and does not require cutting tools. Laser cutting is also a non-contact, non-force process well suited for cutting delicate or fragile parts that cannot take the stress of traditional machining. The thickness, cut pattern, and size of the part can vary depending on the material. A partial list of materials includes:
    Materials that cannot be machined by other means because of lack of conductivity, abrasiveness, or hardness can usually be cut using a laser. Materials with high reflectivity can also be cut but special precautions must be taken. A laser can also easily cut hard plastics with adhesive backs that gum-up stamping tools or knives.

  • Acrylic
  • Alumina
  • Cardboard
  • Ceramic
  • Composites
  • Delrin
  • Fabric
  • Fiberglass
  • Foam
  • Laminate
  • Leather
  • Masonite
  • Matte Board
  • Nylon
  • Paper Products
  • Plastics
  • Plywood
  • Polycarbonate
  • Polyester
  • Rubber
  • Stainless Steel
  • Steel
  • Styrene
  • Teflon
  • Vinyl
  • Veneer
  • Wood
  • 3. How much training will I require?

    The machine controls are versatile, yet easy to understand. Coherent laser cutting machines include custom designed CAM software which manages the entire cutting process, without requiring specialized user training. During the initial machine setup, Coherent will provide free training onsite. This training typically lasts for one or two days.

    4. Does the machine have a crash sensor?

    Yes, the cutting head includes a crash sensor and break-away nozzle to reduce the risk of damage from setup errors.

    5. What flexibility do I have in power settings?

    The control panel is easy to understand and allows you to control all of the machine functions as well as download files, view and edit settings.

    6. How does your machine deal with waste materials?

    A dual exhaust machine provides efficient removal of cutting fumes. The vacuum cutting bed provides material hold-down and removes smoke from through-cutting. An additional top exhaust port removes residual smoke from engraving.

    Many of our customers simply vent outside, but check the Material Safety Data Sheet (MSDS) for its particular properties. Some materials may require a fume filtration machine and dust collector. Check with Coherent or the material supplier before cutting any questionable materials.

    As for material waste, the honeycomb bed allows small pieces to fall through, which will gather in the plume. A shop vacuum can be used to remove the collected material waste.

    Cutting Table

    1. Do I have to clamp parts before cutting?

    The powerful vacuum cutting bed provides hold-down for most materials, however there are exceptions. Please contact us to discuss exceptions.

    2. Does the cutting table move, or does the machine use flying optics?

    The machine uses flying optics. The part being cut remains stationary while the laser beam is directed by mirrors that move over the surface of the bed on an XY table. This high-speed design provides a large cutting area while consuming a minimum of valuable floor space. The entire beam path is enclosed for safety and low maintenance.

    3. How does the machine achieve positioning accuracy?

    The linear drive machines use closed loop servo motors with linear encoders that enable precise positioning and repeatability. This machine provides extremely high accuracy, at all speeds, and does not change over time.

    4. Is accuracy the same over the entire cutting bed?

    Yes.

    5. Is the machine belt driven or ball screw? Why does it matter?

    The machine is belt driven, using closed loop servo motors with linear encoders that enable precise positioning and repeatability. It is much more accurate than a ball screw machine, which wears over time.

    6. What is the tallest item I can fit on the cutting bed?

    Our machines provide up to 12 inches of clearance for cutting or engraving on non-sheet material. By adjusting the height of the cutting bed, the machine allows for custom fixturing of tall parts for secondary laser cutting operations

    Maintenance

    1. What are the operating costs of the machine?

    Operating costs ultimately depend on the laser power you employ, but typically will be less than $1 per hour, including maintenance costs. The assist gas you use will depend on what you are cutting. An air assist gas will only be the cost of running your compressor. However, some materials require specific assist gases, and that will cost you the price of the gas as well.

    2. What are the maintenance requirements of the machine?

    The machine requires basic clean up on a daily basis. Use a shop vacuum to clean the plume and cutting bed, and wipe it down with a cleaner once a week. The encoder strip can be cleaned with alcohol only.

    3. How often do I have to replace parts?

    One of the many advantages of a laser cutting machine is that there are no tools to wear or break over time. There are few consumable parts within the machine itself. The honeycomb bed will need to be replaced as it degrades over time. This part is about $200 and typically needs to be changed every 6 months. Other parts can be replaced as required, but should not be often. The flying optics are sealed and protected, and should not have to be replaced with proper operation. However, all parts are readily available from Coherent if necessary.

    Software

    1. Does the machine include CAD/CAM software?

    Yes, Coherent’s proprietary LaserLink software is a CAD/CAM package designed specifically for laser cutting. LaserLink lets you easily edit geometry, manipulate layers, control the tool path, step-and-repeat parts and combine multiple processes. The user selects settings from an integrated database of materials. The database can be edited and stores an unlimited number of settings.

    2. Does your software support vector or raster engraving?

    Our software supports both vector and raster fill engraving.

    3. Does your software allow importation of files?

    LaserLink imports popular CAD and graphics file formats and supports all TrueType fonts. The program supports the following file types and file extensions:

    CAD (dxf, dwg)
    Gerber (circuit layout) (.GBR, .GER, .PHO)
    Mill/rout Data (.rte, .rou)
    HPGL (.hpg, .hp, .plt)
    CNC code (G-Code) (.CNC)
    Drill file (.drl, .dpt)
    Laser Machining Center files (.lmc)
    Raster files (.bmp, .jpg, .gif, .png)

    4. How is easy is your software to use?

    For those with an existing knowledge of CAD/CAM programs, Laser-Link is very easy to use. For those without prior experience, it may take a little more ramp-up time but they will also find it easy to use after the free training provided by Coherent. If you find you have further questions afterwards, simply use your ongoing telephone or online support and we can quickly supply you with answers

    Glossary

    Accuracy and Repeatability. Accuracy is the ability of the machine to locate to a fixed mechanical position and manufacture parts to a specified tolerance in a controlled production environment. Repeatability is the capability of the machine to maintain tolerance from part to part.

    Class I Safety. Laser safety is regulated in the United States by the FDA. Class I is classified as the safest configuration for a laser system. The Class I rating requires such safety features as a fully enclosed system that cannot allow a laser beam to escape and redundant interlocks on doors that turn off power to the laser if a machine door is opened during the cutting process.

    Class IV Safety. This is an open machine, so safety equipment must be used in the laser hazard area.

    CO2 Laser. Gas lasers that use carbon dioxide as the lasing medium. CO2 lasers are offered in either sealed or flowing gas configurations. Sealed CO2 lasers are generally under 500 watts and are less expensive to operate.

    Dross. Dross is recast molten metal at the back or bottom of a laser cut metal part. Dross is controlled by manipulation of cut parameters like assist gas pressure (the gas jet blowing co-axially with the laser beam during the cutting process.)

    Edge Quality. The level of quality the edge of a part has when immediately removed from the machine. When Coherent talks about thickness of material we can cut, we are talking about what we can cut with excellent edge quality that will generally require little or no additional polishing, sanding, or deburring.

    Engraving. To carve or etch a design or letters into a material. The laser engraving process can be either Vector (line following) or Raster (scanning with the laser turning on or off to create an image).

    Flying Optics. The part being cut remains stationary while the laser beam is directed by mirrors to a gantry that moves at high speed over the part.

    Gantry. A mount for the laser consisting of a bridge-like frame designed to move along a set of tracks over an XY table.

    Galvo-based Laser System. Galvo systems direct a laser beam by a fast moving mirror (similar to a signal mirror reflecting sunlight). Galvo laser systems are generally suited to cutting thin materials in a relatively small field. Thicker materials will tend to burn and have non-vertical cut edge. Because these mirrors and the servo motors that drive them are very tiny, they have very little mass and can be moved at high speeds and stopped very quickly.

    Gas-assist. Assist gas is a gas jet blown coaxially with the laser beam to assist and improve the results of the laser cutting process. The type of gas will depend on the application, but the most commonly used gasses are Air, Nitrogen and Oxygen. Assist gas works by either increasing or decreasing the vaporization effect of the laser energy and conveying the waste gas and molten material down and out of the cut.

    Gimbal. A contrivance, consisting of a ring or base on an axis, that permits an object mounted in or on it to tilt freely in any direction, in effect suspending the object so that it will remain horizontal even when its support is tipped.

    HAZ – Heat Affected Zone. The Heat Affected Zone is the cut edge of the part and that area of and into the part that has been chemically or cosmetically affected by the concentrated heat of the laser cutting process. An important goal in laser process development is to find cut parameters to minimize the Heat Affected Zone.

    Kerf. The width of a groove or cut made by a cutting tool.

    Linear Encoder. Linear encoders are optically read high precision “rulers”. Coherent uses linear encoders on the Ya, Yb and X axes in closed loop with servo motors to ensure high precision that doesn’t wear out over time.

    Precision. The ability of a measurement to be consistently reproduced.

    Rotary Encoder. An encoder is an electrical mechanical device that can monitor motion or position. A typical encoder uses optical sensors to provide a series of pulses that can be translated into motion, position, or direction. Rotary encoders are based in the actual motor, and use pulses to determine its position.

    Servo Motor. A Servo is a small device that has an output shaft. This shaft can be positioned to specific angular positions by sending the servo a coded signal. As long as the coded signal exists on the input line, the servo will maintain the angular position of the shaft. As the coded signal changes, the angular position of the shaft changes.

    Throughput. The number of quality finished parts produced per hour. Generally throughput consists of cut speed, acceleration and other process parameters.

    YAG Laser. Solid-state lasers that use the element Neodymium (Nd) diffused in a crystal of Yttrium-Aluminum-Garnet (YAG) as the lasing medium


    Calibration and Repair

    Coherent’s Wilsonville, Oregon calibration laboratory is fully accredited to ISO/IEC 17025:2005 by ANAB, a brand of the ANSI-ASQ National Accreditation Board and recognized internationally by ILAC, APLAC, and IAAC. Certification to ISO 17025 is a formal recognition that a calibration laboratory is using valid and appropriate methods and is competent to carry out specified tests or calibrations.

    A detailed discussion of the Scope of Accreditation and the Technical Requirements of ISO 17025 Accreditation can be found on our ISO 17025:2005 Accredited web page.

    Calibration of a Coherent power and energy laser measurement product includes:
    Minor repairs including fixing manufacturer’s defects, hardware updates, firmware, software updates, damaged connectors, and other small repairs. Detector element replacement due to laser damage and damage caused by negligent use is not covered – for customer-caused damage, an additional repair service charge is applied.
    This level of service results in an overall lower cost of ownership for our customers. Those customers who routinely send products in for annual calibration are realizing a lifetime warranty for their products.
    By choosing Coherent, you are choosing a company you can rely on for fast delivery, low warranty rate, and lower overall cost of ownership.

    • Calibration to original uncertainty levels
    • Minor repairs (see note below)
    • Extended, 12 month warranty on eligible products
    • Fast calibration turn around time.

    Re-certify Once a Year

    Coherent laser power and energy meters are precision instruments, capable of delivering very accurate measurements as well as providing many years of useful service. To maintain this high level of performance, and to ensure compliance with your quality and ISO certification, it is important to have your measurement system serviced and re-certified once per year. Extended use of laser power and energy meters and sensors, as well as environmental factors, can have an adverse effect on accuracy and also result in wear and/or damage to parts critical to optimum performance.

    Requesting an RMA#

    To request authorization for a calibration or repair service you must obtain an RMA# from Coherent, Inc. by contacting us at LSMService@coherent.com (US) / LMC.RMA@coherent.com (EU) or Service.LMC.Dieburg@coherent.com (EU). Please include the following information…

    • A detailed description of your problem or your device error
    • Product number/s of each product that needs service
    • Serial number/s of each product that needs service
    • Your contact information (company/institute, full name, email address, phone number, physical address)

    Setup & Preinstallation Information

    Coherent has extensive product documentation for pre and post sales support. Some common product installation guides are provided here, but if you do not see your product information listed, Coherent has worldwide service contacts available to support you and supply whatever you may need for your product.


    Astrella Preinstallation Manual

    AVIA 266 Preinstallation Manual

    AVIA 355-355X Preinstallation Manual

    Compass 315M Quick Setup and Packing Guidelines

    DIAMOND E-1000 Preinstallation Manual

    Diamond E-250 Preinstallation Manual

    Diamond E-400 Preinstallation Manual

    Diamond J-3 Series Preinstallation Manual, RevAB

    Diamond J-5 Series Preinstallation Manual, RevAA

    Diamond G50/100 Quick Setup Guide

    Sabre FreD Preinstallation Manual

    Sabre MotoFreD Preinstallation Manual

    Sabre Preinstallation Manual

    Verdi V-18 Preinstallation Manual

    Verdi V-2/V-5/V-6 Preinstallation Manual

    Verdi V-8/V-10 Preinstallation Manual

    Vitara Preinstallation Manual

    Vitesse Quick Setup Guide

    Warranty Information

    Laser Cooling Guidelines for Innova Ion Laser Systems

    HYPER AOM Preinstallation Guide

    HYPER EOM Preinstallation Guide

    HYPER NX Preinstallation Guide

    Paladin Advanced Preinstallation Manual

    Paladin Preinstallation Manual

    Legend Elite Preinstallation Manual

    Libra Preinstallation Manual

    BioRay Operators Manual

    Coherent StingRay Operators Manual

    Coherent CUBE Operators Manual

    EnergyMax Sensors Manual

    EnergyMax-USB/RS Manual

    FieldMate Manual

    LabMax-Pro SSIM Manual

    LabMax-TO Manual

    LaserCam-HR II Manual

    Please Read Before Continuing

    Risk factors: Except for the historical information contained here, many of the matters discussed in this Web site are forward-looking statements, based on expectations at the time they were made, that involve risks and uncertainties that could cause our results to differ materially from those expressed or implied by such statements. These risks are detailed in the “Factors That May Affect Future Results” section of our latest 10-K or 10-Q filing. Coherent assumes no obligation to update these forward-looking statements.


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