Method of strengthening an optical body by diffusion of material

Coating processes – Optical element produced

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427164, 4273766, 4273831, B05D 506

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052814653

ABSTRACT:
A technique for increasing the strength of long wavelength infrared material, such as zinc sulfide and zinc selenide includes diffusing species which are applied to the materials as thin films into the zinc sulfide and zinc selenide material. Portions of the thin film material are thermally diffused to substantial depths of up to 100 microns below the depth of flaws formed in the body using one of two diffusion techniques. One diffusion technique uses hot isostatic pressure and the other uses a heat treatment carried out at or near ambient pressure in an inert atmosphere, such as argon or other suitable inert gas.

REFERENCES:
patent: 4772080 (1988-09-01), Tustison
patent: 4778731 (1988-10-01), Krastz et al.
patent: 4889746 (1989-12-01), Utsumi et al.
patent: 4944900 (1990-07-01), Willingham et al.
patent: 5067781 (1991-11-01), Montanari et al.
Stress in Y.sub.2 O.sub.3 thin films deposited by radio-frequency magnetron and ion beam sputtering. R. W. Tutison, T. E. Varitimos, D. G. Montanari, and J. M. Wahl. J. Vac. Sci. Technol. A 7(3) May/Jun. 1989.

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