METHOD OF PRODUCTION OF POLYCRYSTAL ZINC SELENIDE Russian patent published in 2005 - IPC

FIELD: infra-red optics; production of zinc selenide specimens more than 20 mm in thickness used as passive optic elements of high-power CO₂ lasers and other equipment working in infra-red range of long waves.

SUBSTANCE: proposed method includes delivery of hydrogen selenide and zinc vapor by argon flow to substrates heated to temperature of 650-750 C and sedimentation of zinc selenide on them at total pressure of 0.5-1.3 kPa, equimolar flow rates of zinc and hydrogen selenide is equal to 0.4-0.47 l/min and that of argon of 3-4 l/min; temperature of substrates is increased at rate of 0.1-0.15 deg./h throughout the entire period of selenide sedimentation. Zinc selenide obtained by this method has size of grains of 30-80 mcm and possesses the property of absorption at wave length of CO₂ not above 5.10^-4 cm^-1.

EFFECT: enhanced efficiency.

2 cl, 1 ex