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Light scattering in a Fabry-Perot cavity by an acoustic beam is discussed. An heuristic treatment based on momentum conservation is used to determine the conditions, acoustic bandwidth and enhancement of the scattering interaction. A more detailed and rigorous calculation based on a coupled-mode formalism is also described. Experimental results using fused quartz Fabry-Perot cavities, single-frequency 6328 Å light and acoustic waves in the frequency range 200–500 Mc/s, are presented. Enhancement relative to single-pass scattering by a factor of 50 is easily achieved. Modulation depths of twenty-five percent with a bandwidth of several megacycles have been observed.
Cohen et al. (1966) studied this question.