A.A. Golubeva - Post-graduate Student, Department «Physics», Yuri Gagarin State Technical University of Saratov. E-mail: annamoroz@mail.ru N.M. Ushakov - Dr. Sc. (Phys.-Math.),проф, Head of Laboratory of Submicron Electronics, Saratov branch of Kotel\'nikov IRE of RAS. E-mail: nmu@bk.ru

Refraction indexes and phase velocities of acoustic waves, propagating along any preset direction in lithium niobates crystal, are calcu-lated with the help of suggested coordinate method. Allowing for the performed analysis of optical and acoustical properties, collinear anisotropic diffraction on the longitudinal and lateral acoustic waves, propagating in the plates XOZ and YOZ turned on arbitrary angle in lithium niobates crystal are investigated. Basing on the obtained analytical expression for effective photo-elastic susceptibility, angle de-pendencies for the factor of optoacoustic quality of the material in these planes are built. It is revealed the turn of XOZ- plane in the di-rection of YOZ-plane leads both to the shift of the quality maximum M2 at φ = 90° to the state at φ = 100° and to diminishing three times and more its value. At the same time, two asymmetric by the value maximums of quality factor at φ = 20° and φ = 110° appears in YOZ-plane. These maximum values exceed by the order the values obtained for XOZ-plane. These data can be useful for the develop-ment of optoacoustic filters on collinear anisotropic light diffraction.

 

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