Optics
F-Theta Scan Lenses for 1 µm
Optimize performance in laser welding, marking, engraving, and cutting applications with scan lenses based on zinc sulfide multispectral and fused silica materials.
Zinc sulfide multispectral has high thermal conductivity for reduced thermal focus shift and a high refractive index to minimize component count. Especially when combined with aspheric surfaces, this delivers better performance and lighter weight.
1 μm F-Theta Scan Lens Specifications
Get scan lenses over a range of focal lengths and field sizes for high- and low-power materials processing tasks that use near-infrared fiber and solid-state lasers.
| Parameter | Model | ||||
| Laser | SL4-1.03-1.08-123-90-165-DW | SL2-1.03-1.08-62-142-275-DW | SL2-1.03-1.08-74-200-400 | SL2-1.03-1.08-87-400-650-DW | |
Wavelength (μm) |
1.03 to 1.08 |
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Laser Power (w) |
8 kW |
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CW or Pulse |
CW |
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Input Beam Diameter at 1/e² (mm) |
15 |
20 |
20 |
||
Minimum Clear Aperture for Full Beam (mm) at Galvo Input |
15 |
30 |
20 |
||
Galvo Mirror Specifications |
|||||
Dist. Between X & Y Scan Mirror (mm) |
19.7 |
18 |
16 |
21 |
|
Distance from Y Scan Mirror to Edge of Lens Housing (mm) |
16 |
15 |
26 |
26 |
|
Clear Aperture (mm) |
15 |
15 |
20 |
20 |
|
Input Scan Angle (optical angle in degrees) |
16 x 16.4 |
14.4 x 15 |
13.5 x 14.1 |
18 x 17 |
|
Scan Lens Specifications |
|||||
EFL (mm) |
163 |
277 |
400 |
650 |
|
Working Distance (mm) |
197 |
302 |
430 |
700 |
|
Telecentric Error (deg) |
< 4 |
< 11 |
< 11 |
< 14 |
|
Square Field Size (mm) |
90 x 90 |
142 x 142 |
200 x 200 |
400 x 400 |
|
Lens Materials |
FS + ZnS (MS) |
FS + ZnS (MS) |
FS + ZnS (MS) |
FS + ZnS (MS) |
|
Number of Elements (if restricted) |
4 |
2 |
2 |
2 |
|
Theoretical Focused Spot Characteristics |
|||||
Spot Size (μm at 1/e² power points) |
21 |
33 |
35 |
57 |
|
Beam Size Variation Across Field (%) |
6 |
12 |
13 |
13 |
|
Circularity (shortest/longest width) |
> 0.94 |
> 0.88 |
> 0.9 |
> 0.9 |
|
Field Sag (μm) |
< 40 |
< 300 |
< 300 |
< 1600 |
|
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Optical Manufacturing Capabilities
Learn about the vertically integrated capabilities for material growth, fabrication, coating, and assembly, and rigorous QA at Coherent. Discover how these ensure the performance and reliability of our optics and minimize supply chain risks and uncertainties.
