Using light scattering and the photoelastic effect, we have investigated the frequency spectrum of giant acoustic shear wave packets generated in semiconducting CdS by high electric fields. The frequencies were in the range 100 to 1500 MHz, at least an order of magnitude lower than the predicted frequency for maximum net gain. The strains were high enough to cause permanent crystal damage.
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Zucker et al. (1966) studied this question.
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