Isotropic Acousto-Optical Diffraction of Bessel Light Beams in Anisotropic Crystals

Abstract

There were investigated the peculiarities of acousto-optical (AO) diffraction with the participation of Bessel light and Bessel acoustic beams in acoustically transverse isotropic crystals of hexagonal symmetry. AO diffraction was studied on vertically-polarized (SV-) acoustic transverse wave, which has a more complex polarization structure compared to horizontally polarized (SH-) wave, the diffraction on which was studied earlier [1]-[3]. It is shown that the use of SV-wave leads to modulation also of diagonal components of permittivity tensor that allows using them in the process of AO interaction. It is established that due to diagonal components $\Delta {\varepsilon _{ii}}$ of the permittivity tensor the isotropic diffraction of Bessel light beam with high efficiency can be realized. The proposed in the work schemes of AO interaction are perspective for dynamic reconstruction in wide limits of cone angle of Bessel light beams and also for transformation of the order of their screw dislocations.