Zinc Sulphur
Zinc Sulphur( ZnS) mateiral have two grades and can be use in imaging systems. Regular grade material is grown by the chemical vapor deposition process. This material is often used in the 3um to 5 um and 8um to 12 um region. It has reasonable hardness and is moderately priced. It is available in large size as well. It can replace ZnSe in certain harsh environment. Multi Spectral grade ZnS is treated after growth to eliminate microscopic voids and defects which occur in the regular grade, thus extending the usefulness of this material to include the visible region.
