The acoustic field of a slow quasi-shear wave created by a plane converter with a Gaussian aperture function close to the crystallographic direction [110] is investigated for paratellurite and calomel crystals. The parabolic approximation of the wave-vector surface is used. The dependence of the parabolic-approximation coefficients on the wave-vector direction is given. The limits of parabolicity are given. The method of calculating the geometry of the acoustic beam excited along the axis [110] is considered.
Department of Physics of Oscillations, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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