Polarization properties of the acousto-optical interaction in a planar layer

Polarization features of the Bragg diffraction of light on ultrasound in a planar layer are studied. It is shown that the rotation of the polarization plane of the diffracted wave is determined by Fresnel reflection of the s and p components of the incident light and by anisotropy of the photoelastic effect in the crystalline layer perturbed by the ultrasound. It is established that the inclusion of an analyzer into the scheme of the acousto-optical interaction allows one to transform the rotation of the polarization plane of the diffracted wave transmitted through and reflected from the layer into the amplitude modulation of light.