The transmission range of Zinc Selenide ZnSe-CVD is around 0.5 - 20 µm. The refractive index of ZnSe is near 2.4. Zinc Selenide has a very low absorbtion coefficient and is used extensively for high power infrared laser optic. ZnSe material is a chemically inert, non-hygroscopic and highly pure product that is very effective in many optical applications due to its extremely low bulk losses, high resistance to thermal shock and stability in virtually all environments, easily machined.

CVD ZnSe is widely used for high power CO2 laser at 10.6µm, used as protective windows or optical elements in FLIR thermal imaging equipment, optics for medical and industrial applications plane windows, wedged windows etc.