We present comprehensive experimental measurements and analysis of anisotropy of the acoustic wave velocities for TI(3)AsS(4) crystals, including the obliquity and nonorthogonality of the acoustic waves, and the deviations from purely longitudinal and transverse polarization types. We have found that the crystals under analysis are characterized by rather low transverse wave velocities v(23) and v(32), which are both equal to 630 m/s. It is shown that the efficiency of acoustooptic (AO) interactions in TI(3)AsS(4) can be notably increased when providing anisotropic interaction with the slowest transverse acoustic wave. Under the previously mentioned conditions, the AO figure-of-merit can be estimated to be extremely high, i.e., approximately 3×10(-12) s(3)/kg.
In this work we present the results of comprehensive studies of the piezo-optic and elasto-optic effects in NaBi(MoO4)2 crystals. The full matrices of the piezo-optic and elasto-optic coefficients for the NaBi(MoO4)2 crystals are obtained for the first time, to the best of our knowledge. The acousto-optic effect in the NaBi(MoO4)2 is analyzed for the case of interactions of optical waves with the slowest acoustic waves. It is shown that the crystals under analysis can be efficiently used as working elements for the collinear acousto-optic tunable filters.
Abstract.We present the studies of anisotropy of acoustic wave (AW) propagation in AgGaGe 3 Se 8 crystals. Complete matrices of mechanical stiffness and compliance coefficients are determined basing on the experimental values of AW velocities. Cross sections of AW velocity surfaces by the principal crystallographic planes are obtained. We have found that the velocities of quasi-transverse and quasilongitudinal AWs propagating in the AgGaGe 3 Se 8 crystals can be very low, thus facilitating potentially high acoustooptic figures of merit.
Basing on the comprehensive studies of acoustic properties for NaBi(MoO 4) 2 crystals, we have determined the full matrices of elastic stiffness and compliance coefficients and constructed cross sections of acoustic-wave velocity surfaces by the principal crystallographic planes. We have shown that the slowest acoustic wave propagates in the ab plane at the angle 61.9 deg with respect to the a axis and has the velocity ~ 1948 m/s. The interaction with that wave is expected to provide the highest acoustooptic figure of merit. Deviations of polarization states of the acoustic waves from the purely longitudinal and transverse types and deviations of the acoustic energy flux from the wave vector direction are analyzed for the NaBi(MoO 4) 2 crystals.
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