Influence of acoustic anisotropy in paratellurite on quasicollinear acousto-optic interaction

• The TeO2 anisotropy influences much the acoustic beams structure propagating in it.
• Acoustic field structure influence the acousto-optic diffraction characteristics.
• The phase shift appear during the acoustic beam reflection.

The influence of paratellurite acoustic anisotropy on the quasicollinear acousto-optic diffraction characteristics was examined. In the presented case the quasicollinear geometry of acousto-optic diffraction is realized with the use of acoustic beam reflection from one of the crystal surfaces. The simulations were based on the solution of acoustic beams propagation problem for anisotropic media previously presented in Balakshy and Mantsevich (2012). It is shown that media inhomogeneity affects the distribution of the acoustic energy in the ultrasound beam and the shape of wave fronts. The acoustic beam structure influences the characteristics of quasicollinear acousto-optic diffraction causing transformation of acousto-optic device transmission function shape and reducing the diffraction efficiency.