Peculiarities of acousto-optic diffraction at circularly polarized acoustic waves. Determination of elasto-optic coefficients coupled with shear waves. Errata

Abstract

. We develop a new approach for determining some of elasto-optic coefficients ( p ij with i = 1…6 and j = 4, 5) basing on Dixon–Cohen method and acousto-optic diffraction at circularly polarized acoustic waves. Particular cases of crystals that belong to trigonal system and some symmetry groups of tetragonal and hexagonal systems are analyzed. We find that the effective elasto-optic coefficients are different for the alternative cases of diffractions at either right- or left-handed circularly polarized acoustic waves that propagate along Z axis in crystals. One can determine in this way the coefficients p 44 and p 45 at the anisotropic diffraction in the crystals belonging to point symmetry groups 4, 4/m, 4 , 6, 6/m and 6 . For the crystals belonging to symmetry groups 32, 3m and 3m , it is possible to determine the coefficients p 14 and p 44 respectively at the isotropic and anisotropic diffractions. Finally, for the crystals described by the groups 3 and 3 , one can determine separately the four coefficients p 44 , p 45 , p 25 and p 14 following from the anisotropic-diffraction data and the two coefficients p 14 and p 25 following from the isotropic-diffraction data.