Abstract

It is shown that a subharmonic grating may have two different phase relationships relative to the fundamental grating, leading to the appearance of domains. The subharmonic beam is generated in a Bi₁₂GiO₂₀ crystal illuminated by two beams in the presence of an applied ac square-wave voltage. The domain structure and the relative phases of the gratings contained in them have been observed with the aid of an interferometric technique.

© 1993 Optical Society of America

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

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