Parametric generation of a spatial subharmonic grating in photorefractive crystals: theory

Abstract

The instability of a spatial subharmonic grating during photorefractive hologram recording is investigated theoretically. It is shown that such instability arises in crystals if the electron drift length in the external field exceeds the fundamental grating period. Cases with dc and ac external fields are considered. The influence of diffusion and trap charge saturation is examined.

© 1993 Optical Society of America

Space-charge waves in photorefractive crystals and their parametric excitation

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J. Opt. Soc. Am. B 10(9) 1600-1604 (1993)