Diffraction of light by ultrasound in crystals with strongly anisotropic acoustic properties has been studied. It has been shown that acoustic anisotropy of crystals affects the acoustic frequency bandwidth of Bragg diffraction and the diffracted light intensity. Analysis of the acoustooptic interaction in gallium arsenide crystals reveals a significant change in the frequency bandwidth of diffraction for angles between the phase and group sound velocities greater than $\psi=\:$10-20$^о$ as compared to the acoustically isotropic case. The diffraction efficiency in GaAs differs from the isotropic case by more than 10%. With increasing acoustic beam walk-off, when $\psi>20$$^о$, this difference becomes even greater.
Department of Physics of Oscillations, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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