Abstract
We propose a novel method to calculate acousto-optic gure of merit in crystals. Calculations are performed in laboratory coordinate system where Z′-axis is collinear with wave vector of ultrasound and the Fresnel equation is considered as an equation on the third component of refractive index vector. The method is applicable to both uniaxial and biaxial crystals. In this paper, we compared obtained values of acousto-optic gure of merit with values from literature data for uniaxial crystals such as paratellurite, lithium niobate, tellurium and for biaxial crystals such as lead and strontium tetraborates. Calculations in paratellurite were carried out for slow-shear acoustic wave propagating along [110] crystal axis. In lithium niobate crystal, we perform comparison with results for geometry of acousto-optic interaction where acoustic wave vector forms 88◦ angle with X crystal axis and 150.4◦ angle with Z crystal axis. In tellurium crystal, we investigate geometries applied in infrared de ectors. In SrB4O7 and PbB4O7 crystals we analyze acousto-optic characteristics of slow-shear mode propagating along [100] crystal axis. Spatial distributions of acousto-optic gure of merit and acoustic frequency for the mentioned acousto-optic interaction geometries are presented.
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