Acoustical activity of lithium niobate crystals

Acoustical activity in Lithium Niobate crystals was investigated by method of Bragg light diffraction. Transverse acoustic waves were excited in the range of 0.4–1.6 GHz using quartz piezoelectric plates. LiNbO3 samples were oriented at small angles to the axis Z in the crystallographic plane (010). Specific rotation of the polarization plane of transverse waves was determined from the dependence of the intensity of the diffracted light of the distance from the piezoelectric transducer along the acoustic wave propagation. The observed large specific rotation of the polarization plane of the acoustic waves can be used in devices controlling the intensity of light by the phenomenon of acoustical activity. Components of the imaginary part of the generalized Christoffel tensor taking into account the spatial dispersion have been determined also. It is shown that in crystals of class 3m the imaginary components of the Christoffel tensor for all the directions in the symmetry plane (100) are zero.

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