METHOD OF ZINC SELENIDE OPTIC ELEMENTS PROCESSING Russian patent published in 2008 - IPC C30B33/10 C30B29/48 

FIELD: technological processes.

SUBSTANCE: invention is related to methods of processing of massive (diameter of up to 200 mm) optic elements from zinc selenide, which are used as passive optic elements of powerful CO₂-lasers and other devices that work in infrared range of wavelengths. Method includes deep polishing with classified flour of aluminium oxide and deep chemical-mechanical polishing with application of polishing member material on the basis of modified oleoresin with softening temperature of 50-80°C, chemically active component, such as nitric or chloric acid or their mixture with concentration of 0.5-5 M and lubricoolant. Polishing is performed at the pressure of 25-500 g/cm². Method makes it possible to prepare surface of zinc selenide that meets the requirements of 3^rd class of surface purity according to GOST 11141-84 with deviation from the plane of not more than interferential ring with local error of not more than 0.1 of interferential ring. Speed of material removal, at mentioned conditions of processing, makes (4-11)•10^-3 g/hr•cm².

EFFECT: preparation of surface of zinc selenide.

3 cl, 5 ex