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Acoustic anisotropy of AgGaGe3Se8 crystals and their acoustooptic applications

Martynyuk-Lototska I., Kushnirevych M., Myronchuk G. L., Parasyuk O. and Vlokh R.

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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 quasi-longitudinal AWs propagating in the AgGaGe3Se8 crystals can be very low, thus facilitating potentially high acoustooptic figures of merit.

Keywords: acoustooptics, chalcogenide crystals, acoustic wave velocities, elastic properties

PACS: 42.79.Jq, 43.35.Sx
UDC: 535.012.2+535.42+534.321.9
Ukr. J. Phys. Opt. 16 77-84
doi: 10.3116/16091833/16/2/77/2015
Received: 20.03.2015

Анотація.  У роботі представлено результати досліджень анізотропії поширення акустичних хвиль у кристалах AgGaGe3Se8. На основі експериментального вивчення швидкостей поширення акустичних хвиль визначено повні матриці коефіцієнтів жорсткості і податливості цих кристалів. Побудовано перетини поверхонь швидкостей акустичних хвиль головними кристалографічними площинами. Виявлено, що швидкості поширення квазі-поперечних і квазі-поздовжніх акустичних хвиль сягають низьких значень, що повинно привести до великих коефіцієнтів акустооптичної якості кристалів AgGaGe3Se8. 
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