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glossary

CVD zinc sulfide

CVD zinc sulphide is produced in a CVD-process with zinc vapour and hydrogen sulphide. The polycristalline material consists mainly of the cubic sphalerite. Even small amounts of the hexagonal modification wurtzite and other defects lead to a strong light dispersion in the visible and near infrared area. This is why the yellow material, which is opaque in the visible area, is only used in the middle infrared area (7,5 to 11 m). Is is often referred to as "as grown" or FLIR-material. The FLIR-material can be transferred into the colourless, multispectral zinc sulphide, which is transparent in the visible area as well, using hot isostatic pressing.

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