Zinc Selenide (ZnSe) is a popular material in infrared applications. Very wide transmission spectrum, covering the range from 0.6 μm to 22 μm and the high quality of material obtained by CVD (Chemical Vapor Deposition), make it usefull for the production of optical elements (windows, lenses, mirrors) for infrared applications (thermal imaging, FLIR, medical systems, high power IR lasers). Zinc Selenide is produced by synthesis from Zinc vapour and H2Se gas, forming as sheets on Graphite susceptors. Zinc Selenide is microcrystalline in structure, the grain size being controlled to produce maximum strength. This chemically vapor deposited material has wide usage in high power CO2 laser systems because of its low absorption coefficient and high resistance to thermal shock.