A recent paper by Gaumond and Jacobsen analyzed the process of backward-wave, phonon-echo generation in an insulator in terms of solutions of Mathieu's equation. We discuss the experimental conditions under which the predictions of their analysis would be expected to hold, and we report the observation of exponential growth of the echo amplitudes in LiNbO₃.
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Meredith et al. (1984) studied this question.
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