Bragg Diffraction of Light by a Standing Sound Wave

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Abstract
Bragg diffraction of light by a standing sound wave is described. The frequency spectrum and the harmonic components of the diffracted and the undiffracted beams are obtained. These results cannot be obtained by superposing the diffraction effects due to the two travelling waves that make up the standing wave—not even when the acoustic power is low. Successive Bragg diffraction by two identical but oppositely travelling sound waves is also considered. It is shown that ‘simultaneous’ and ‘successive’ Bragg diffraction yield the same instantaneous irradiance of the diffracted and the undiffracted beams in the limit of low acoustic power ; however, the frequency spectrum of the undiffracted beams is always different in the two cases.

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