ON SOME CRYSTAL-OPTIC PROPERTIES OF GAMMA(1)-(GAXIN1-X)(2)SE-3 SINGLE-CRYSTALS

The optical parameters of optically uniaxial gamma(1)-(GaxIn1-x)(2)Se- 3 single crystals are systematically measured and analyzed. The optica l rotatory power along the optical c-axis is determined in visible spe ctral region at 77 K and at room temperature and complemented with the oretical estimates for other crystallographic directions. The g(33) co mponent of the gyration tensor is calculated from the experimental dat a. The dichroism is studied in the vicinity of the absorption edges. T he dispersion of ordinary and extraordinary refraction indices is dete rmined at room temperature for the transparency window 0.57 to 10 mu m . Up to 5 mu m the dispersion can be interpreted in terms of nonintera cting harmonic oscillators (single-term Sellmeier relation).