Anisotropic Bragg diffraction in photorefractive crystals

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Abstract
Light diffraction from photoinduced gratings recorded in anisotropic materials is discussed. In particular anisotropic diffraction in which the diffracted light wave has an orthogonal polarization to the incident wave can be used for optically controllable light deflectors and spatial light modulators. A noncritical configuration has been found which allows light deflection of a He-Ne laser beam at fixed incidence angle within a range of 5.67 deg. by changing the wavelength of the steering Ar+ Laser beam λr using for recording the photorefractive grating (wavelength tuning range: 457.9nm < λr < 514, 5 nm).

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