The Crystal Growth and Application of Sulfosalt Materials
Final rept. 1 Jan 1974-30 Jun 1975
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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This report constitutes the Final Technical Report for Contract No. F33615-72-C-1976, Study of Phase Equilibria in the Systems Tl-As-S and Tl-As-Se -- Crystal Growth and Application of Sulfosalt Materials. As a result of this program, we now have available extensive knowledge of the ternary melting liquidus relations around Tl3PS4 and Tl3PSe4 in the systems Tl-P-S and Tl-P- Se. Optimized crystal growth compositions were determined for Tl3PS4 and Tl3PSe4 and crystal growth from these compositions resulted in remarkably improved optical quality. The optical absorption was reduced to less than 10 of 1cm. Two successful device applications of new single crystal sulfosalt materials were made. In the first, and potentially most important, Tl3AsSe3 was used in an infrared tunable collinear acousto-optic filter in the 3-5 micrometer region. Operation to 5.3 micrometer was achieved, which is the longest wavelength at which any such device has yet been used. Tl3AsS4 was successfully used as a laser intracavity acousto-optic modulator and Q-switch with low drive power requirements. Technical difficulties believed to be associated with two-photon absorption of pump radiation or with phase matching problems prevented successful operation of a 2.1 micrometer pumped optical parametric oscillator on Tl3AsSe3.
- Lasers and Masers