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. In the present work we analyze anisotropy of the acoustic properties and acousto-optic figure of merit (AOFM) in CdS crystals at the collinear acousto-optic interactions. We show that the anisotropy of AW velocity is very small so that the AOFM anisotropy is mainly caused by the anisotropy of effective elastooptic coefficients. The obliquity angle and the angle of deviation of polarization of the acoustic waves (AWs) from purely longitudinal and transverse types are found. The geometries of collinear diffraction at which the maximal AOFM values are reached are determined. It is found that the absolute maximum, M2 = 86.2610s/kg, is peculiar for the type VIII of interactions with the AW QT1 with the frequency f = 49 MHz, which is polarized along the Z axis. In this case the interaction plane is rotated by the angle φZ= 45 deg, and both the light and AW propagate along the X' axis lying in the XY plane. The maximal AOFM values and the appropriate interaction geometries are also determined for the particular case of collinear AO diffraction at the AWs QL and QT2. These values are equal to 4.4110 and 26.2510 s/kg for the interactions with the AWs QL and QT2, respectively.

Anisotropy of acousto-optic figure of merit at the collinear acousto-optic diffraction in hexagonal CdS crystals