Abstract
A microprocessor-controlled multipassed Fabry-Perot interferometer has been developed for high-resolution and high-contrast Brillouin scattering spectroscopy. Using this interferometer, Brillouin scattering experiments have been carried out for GaSe1-xSx mixed crystals having layered structures. Specific features of Brillouin scattering in the layered crystals were presented. Anomalous discontinuities of elastic constants of C44 and C33, related to the shearing and stretching force constants, have been found at the compositional ratios x≃0 and x≃0.4, which are related to the ε-γ and γ-β polytype transformations.
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