The theory of Brillouin scattering from corrugated surfaces developed previously has been applied to semiconductors. The available spectra measured with 5145 AA light has been used for evaluating the elasto-optic constants (k 11 , k 12 , k 44 ) of the medium. For GaAs k 11 =42.5, k 12 =51 and k 44 =25.5. This is the first determination of these constants in GaAs at this wavelength, where other techniques are not applicable. For silicon k 11 =53, k 12 =25 and k 44 =23. It is also shown that in opaque semiconductors the elasto-optic coupling depends strongly on the surface orientation.
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Marvin et al. (1980) studied this question.
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