ANISOTROPY OF ACOUSTO OPTICAL PROPERTIES IN PbMoO4 CRYSTALS WITH NEODYMIUM ADMIXTURE

The anisotropy of the efficiency of Bragg diffraction of light by longitudinal acoustic waves propagating along the [100] and [001] directions in pure and neodymium-doped lead molybdate crystals has been studied. The Nd impurity concentration was approximately 0.2 mol%. The Dixon method was used to determine the effective photoelasticity constants (peff) and the corresponding acousto-optical quality factors (M2) for various directions of polarization of incident light. The velocity of acoustic waves was determined by measurement the angle of Bragg diffraction on these waves. It is shown that in pure and doped lead molybdate crystals there is a dependence of the peff and M2on the direction of propagation of the acoustic wave and the polarization of the incident light.