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ZnSe (Zinc Selenide) is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it’s critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry.
ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It’s safe to use in most industrial, field, and laboratory environments.
ZnSe Characteristics & Transmission Curve 
ZnSe Windows Specifications:
|
Material |
Zinc Selenide |
|
Dimension Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
±0.1mm |
|
Surface Accuracy |
λ/4@632.8nm |
|
Surface Quality |
60-40 |
|
Parallelism |
<1' |
|
Clear Aperture |
>90% |
|
Bevel |
<0.2×45° |
|
Coating |
upon request |
ZnSe Windows_Standard products
ZnSe Lenses Specifications:
|
Material |
Zinc Selenide |
|
Design Wavelength |
10.6μm |
|
Focal Length Tolerance |
±1% |
|
Diameter Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
0.2mm |
|
Surface Accuracy |
λ/2@632.8nm |
|
Surface Quality |
60-40 |
|
Centration |
<3' |
|
Clear Aperture |
>80% |
|
Bevel |
<0.2x45° |
|
Coating |
AR Coating @ 8-12μm |