Anisotropy of acousto-optic figure of merit in tetragonal crystals with accounting for non-orthogonality of acoustic eigenwave polarizations. 2. The cases of Li2B4O7 and TeO2 crystals

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We analyze anisotropy of acousto-optic figure of merit (AOFM) M 2 at the isotropic acousto-optic (AO) diffraction in Li 2 B 4 O 7 and TeO 2 crystals.The diffraction takes place inside crystallographic planes, under the condition that the effect of non-orthogonality of acoustic-wave polarizations is taken into account.The geometries of AO diffraction, at which maximal AOFM values are reached, are determined for all the types of isotropic AO interactions.It is found that the global AOFM maximum for Li 2 B 4 O 7 in the case of isotropic diffraction is equal to M 2 = 3.4×10 -15 s 3 /kg.It is achieved using the type I of AO interactions with a socalled acoustic wave QT 1 in the crystallographic planes ac or bc.For TeO 2 crystals, the AOFM maximum for the isotropic AO interactions (M 2 = 71.0×10-15 s 3 /kg) is achieved at the type IV of AO interactions in the principal planes ac or bc.