RU1526303C - Method of thermal treatment of zinc-selenide optical elements - Google Patents

Description

1

(21) 4378161/26 (22) 02/18/88 (46) 05/07/93. B yul. fvh 17 (72) L.P. Galchiyetsky, V.D. Ryzhikov, N.G. Starzhinsky and M.Sh. Feiner (56) Karlov Y.V., Siskin E.V. Optical materials for COa lasers. Lime of the USSR Academy of Sciences, ser. Fizicheskaya, 1980, v. 44, No. 8, p. 1631-1638.

The author's certificate of the USSR M-1111516, cl. With 30 V 33/00, 1E82. (54) METHOD FOR THERMAL PROCESSING OF OPTICAL ELEMENTS FROM ZINC SEENIDE

(57) The invention relates to the processing of crystals, in particular zinc selenide, and makes it possible to reduce their optical absorption coefficient in the infrared region. An optical element is obtained from a crystal of zinc selenide by cutting, grinding and polishing. The element is subjected to heat treatment in an atmosphere of saturated palladium vapor at lOOO-IOSO C for 40-44 hours. The optical absorption coefficient is reduced to a wavelength of 10.6 μm from 3.5 to 10 cm. 1 tab.

The invention relates to the production of materials used in electronic instrumentation, laser power optics and technology, in laser spectroscopy, and can be used, for example, in the development of high-power CO2 lasers, optical shutters, and modulators.

The aim of the invention is to reduce the optical absorption coefficient in the infrared region.

PRI me R i. Disks 25 mm in diameter and 6 mm in diameter are cut out of a zinc selenide crystal obtained by growing from a melt under argon pressure. They were carried out (|| C1isu and polyacro. Optical elements were obtained with a diameter of 25 mm and a thickness of 5 mm with optically polished work surfaces. Then the optical elements were placed on a quartz ampoule of 150 cm into which a tellurium sample was added, which was sufficient to obtain saturated vapor. An ampoule with optical elements and a tellurium sample is evacuated to 10 mmHg and placed in

resistance electric furnace. The temperature in the furnace was brought to, maintained at this temperature for 40 hours, then the furnace was turned off. After the oven has cooled down to room temperature, the ampoule is taken out, broken, the optical elements are extracted and their absorbed coefficients are measured and, which turn out to be 3

Example 2. The process is carried out as in Example 1, but the temperature and the duration of the heat treatment are changed. The data on the absorption coefficients of the elements are shown in the table.

Thus, from the examples it is unfortunate that the method according to the invention allows, in comparison with the prototype, to reduce the coefficient of optical absorption coefficient o (cells; elements from zinc selenide crystals ns 1-2 orders of magnitude. The method ensures high optical uniformity of the material composition due to an increase in its radiation strength.

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Claims (1)

The claims Method for heat treatment of optical elements from zinc selenide, including and in order to reduce the optical absorption coefficient in the infrared region, the heat treatment is carried out in an atmosphere of saturated tellurium vapor at holding when they are heated, heating and heating up to 1000-1050 ° C for 40-44 hours 950 1050 44.0 1100 50,0 4 (prototype) 400 2,5 and in order to reduce the optical absorption coefficient in the infrared region, the heat treatment is carried out in an atmosphere of saturated tellurium vapor at  heating to 1000-1050 ° C for 40-44 hours The process of extraction of the impurity and dissipation of the inhomogeneities did not go completely The process of extraction of the impurity and resorption and non-uniformity completed completely Sublimation of the material, melting of the edges of the elements is observed, the class of processing of optical surfaces deteriorates.