TO Series Wavelength Stabilized TO Can Lasers
TO Series Wavelength Stabilized TO Can Lasers

SureLock™ 640 nm Wavelength Stabilized Laser Diode

Coherent’s 640 nm Wavelength Stabilized Laser Diode is a single mode, single-frequency laser in an ultra-compact TO-can footprint. The extremely narrow linewidth, broad temperature operating characteristics and low power consumption deliver affordable, portable instrument-quality performance for a broad range of instrumentation applications. All SureLock™ Series lasers are stabilized using the Coherent PowerLocker® Volume Holographic Grating, ensuring precise, ultra-stable center wavelengths, low temperature dependence, and consistent optical performance over the locked region.

640 nm Single Mode, Single-Frequency

TO-Can Laser for Instrumentation

Specification Summary

Parameter Symbol Min Typ Max Unit
Output Power Po 32 mW
Center Wavelength1 LP 639 640 641 nm
Linewidth Δλ 150 MHz
Central Stabilized Temperature Tc 15 40 °C
Stabilized Temperature Range Tr 5 10 °C

Table 1: SureLock™ Specifications

1Please specify wavelength at time of order

Operating Specifications

Parameter Symbol Min Typ Max Unit
Threshold Current Ith 40 60 mA
Operating Current Iop 60 80 mA
Operating Voltage Vop 2.3 2.5 V
Laser Reverse Voltage Vrl 2 V
Monitoring Output Current Im 0.05 0.15 0.4 MA
Beam Divergence, Perpendicular Qv 25 30 35 Degrees
Beam Divergence, Parallel Qh 6 8 10 Degrees
Off Axis Angle, Perpendicular dQv -2 2 Degrees
Off Axis Angle, Parallel dQh -2 2 Degrees
Emitter Size 1 x 3 µm
Differential Efficiency DE (dP/dI) 0.5 mW/mA
Operating Temperature2 Top 0 40 °C
Storage Temperature2 Ts -10 60 °C
Polarization 100:1
Polarization Orientation TM

Table 2: SureLock™ Operating Specifications

All specifications are at rated power with a case temperature of 25°C unless otherwise noted



Raman Spectroscopy
HeNe Replacement
Analytical Instrumentation
Graphic Arts

Features & Benefits

  • Single frequency performance
  • Narrow linewidth <150 MHz
  • Wavelength stability <0.015 nm/°C
  • Coherence length >2 m
  • Compact, hermetically sealed TO footprint
  • Narrow-band ASE filters available

Related Materials

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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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