Ultrasound field structure simulation in acousto-optic cells with acoustic beam reflection

Abstract

Some part of the acousto-optic devices fabricated from various crystals applies acoustic wave reflection from one of the crystal facets to arouse the wave with characteristics needed. The acoustic wave is at first aroused by piezoelectric transducer. It propagates along some direction and reflects from the acousto-optic cell face. The face orientation gives the possibility to obtain desired acoustic wave after the reflection. The reflection may be accompanied by the change of the acoustic mode type. The reflection process affects the acoustic beam structure causing the redistribution of acoustic energy inside the beam and the inclination of wave fronts. In this research the influence of acoustic beam reflection on the acoustoc field structure in the quasi-collinear acousto-optic cells fabricated from the tellurium dioxide crystal is examined and compared with acoustic beam reflection in collinear acousto-optic cell fabricated from the calcium molybdate crystal. Tellurium dioxide crystal has extremely strong acoustic anisotropy while calcium molybdate may be considered as acoustically isotropic media. The examined problem is solved using the original method when the media acoustic anisotropy influence on every component of ultrasound beam angular spectrum is taken into account. The presented research has also the applied importance as acoustic field structure influence on the acousto-optic devices characteristics. [This research was supported by the RSF grant №14-22-0042.]