ZnSe Window
Product Details:
Zinc selenide (ZnSe) is the most popular material for infrared applications, windows, lenses, and partial reflectors in the IR region. It has low absorption in the red end of the visible spectrum and quite stable in the laboratory environment. Custom Zinc Selenide windows are available in any size and configuration.

Physical Specifications:
Bulk absorption coefficient @ 10.6 µm : 0.6-1.0×10-3 cm-1
Coefficient of linear thermal expansion : 8.56×10-6 °C-1
Parallelism : 3 arcmin
Crystal type : cubic
Surface quality : 40-20 °C-1
Scratch & dig clear aperture : 90% of the diameter Diameter
Tolerance : 0.0 -0.13 mm
Thickness tolerance : ±0.1 mm
Flatness : λ /40 per inch @ 10.6 µm over clear aperture