Abstract
AbstractThe dispersion curves of the resonant Brillouin scattering cross sections in GaAs measured by Garrod and Bray are analyzed on the basis of the resonant Brillouin scattering theory and piezobirefringence theory. The resonant enhancement and cancellation are found to be well interpreted in terms of the sign reversal of the Brillouin amplitude (or photoelastic constant). A good agreement is found between the experimental data and the present analysis. In addition the present analysis predicts a cancellation of the Brillouin scattering at Λ = 0.976 μm for the scattering by the slow transverse (Tl) acoustic phonons. This prediction is supported by the analysis of the photoelastic constant made by using piezobirefringence theory.
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