Abstract
The influence of light-induced gratings, caused by cubic optical nonlinearity, on the Bragg diffraction of Bessel light beams by ultrasound in uniaxial gyrotropic crystals was studied theoretically. It was shown that, when Bessel light beams are used, the threshold for a substantial manifestation of optical nonlinearity during Bragg diffraction is significantly reduced. It was established that the efficiency of the acousto-optic interaction increases with increasing light intensity in the anti-Stokes regime of diffraction and decreases monotonically in the Stokes regime. Satisfactory qualitative agreement between the theoretical and experimental dependences of the diffraction efficiency on the light and ultrasound intensities was demonstrated using a uniaxial gyrotropic quartz crystal.
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