The acoustic properties of crystalline double lead molybdate, which are promising for acoustoop tics, have been investigated. All elasticity coefficients of Pb 2 MoO 5 crystal, the phase velocities of acoustic waves, and the angles between the vectors of phase and group velocities of this material have been determined. The acoustic parameters of the crystal have been calculated based on experimental data from the SchaeferBergmann diagrams. The phase velocity of acoustic waves along some directions has also been determined by the standard (in acoustics) echo pulse method.
We report linear acoustic and acousto-optical properties of LiNa5Mo9O30 (LNM) single crystal. This relatively new crystal, known for its complex crystallographic structure, is optically biaxial with high birefringence of 0.2545 at 450.2 nm, and crystals that consist of molybdates are widely used in different applications, from cintillators, double β-decay detectors, “dark matter” sensors to electro optics. The lowest measured propagation velocity of shear wave was 1200 m/s, and for the longitudinal mode it was 4100 m/s, which are a relatively low value for crystalline media. The maximum attenuation of the longitudinal wave at a frequency of 180 MHz was moderate and equal 20 dB/cm·GHz2. The values of the acousto-optic figure of merit for light diffraction on a longitudinal acoustic wave were also determined, the maximum value of the coefficient was 13 c.u., which exceeds the efficiency of the one used in AO devices material α-SiO2. Thus, the set of measured acoustic and elastic-optical properties shows a new promising optically biaxial material for acousto-optics, which needs for further researching.
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