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We have developed the approach for analyzing of anisotropy of acoustoopticfigure of merit (AOFM) for lithium niobate crystals in the case of isotropicacoustooptic (AO) diffraction. The working relations for the effectiveelastooptic coefficients and the AOFM have been derived. We have found that,under the conditions of isotropic AO diffraction, the maximum AOFM value forLiNbO3 is equal tp 11.62x10-15s3/kg. It is peculiar for the geometry of AOinteraction of the shear acoustic wave propagating in the YZ plane (thevelocity 3994 m/s) with the optical wave polarized in the same plane. We havedemonstrated that the maximum AOFM values are achieved mainly due to essentialanisotropy and high values of the elastooptic coefficients of LiNbO3.

Anisotropy of the acoustooptic figure of merit for LiNbO3 crystals. Isotropic diffraction