Acoustic anisotropy of AgGaGe3Se8 crystals and their acoustooptic applications

Abstract. We present the studies of anisotropy of acoustic wave (AW) propagation in AgGaGe3Se8 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 AgGaGe3Se8 crystals can be very low, thus facilitating potentially high acoustooptic figures of merit.

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