Acousto-optical modulation of Bessel light beams in paratellurite crystals

Acousto-optical modulation of Bessel light beams on ultrasound in uniaxial gyrotropic crystals of paratellurite has been theoretically investigated. It is established that the efficiency of anisotropic Bragg diffraction of zero-order Bessel light beams is higher than that of first-order asimutally inhomogeneous beams. It is shown that the highest diffraction efficiency for a first-order Bessel beam is achieved for the acousto-optical transformation of a left-elliptically polarized light wave into a right-elliptically polarized one. The bandwidth of the device remains unchanged under optimal conditions of one hundred percent diffraction efficiency for Bessel beams of various orders and decreases with increasing acousto-optic interaction length.