Abstract
Beam fanning and internal self-pumped conjugation in photorefractive crystals has been observed by many experimentalists.1 Pictures of these processes taken from above the crystal generally show straight line segments that fan away from the incident beam, and, in the case of self-pumped conjugation, fan into a corner of the crystal where they undergo total internal reflection. There often appear to be multiple segments resulting in a kinky beam path, see, for example, Fig. 7 of Ref 4, and Ref. 5, Most explanations of this phenomenon attribute it to a two-wave interaction between the input beam of light and noise associated with scattering caused by inhomogeneities and inclusions within the photorefractive material. We show that, although this is essentially true, it is not necessary that the noise be present for fanning to occur.
© 1992 Optical Society of America
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