Effect of deviation from purely transverse and longitudinal polarization states of acoustic waves on the anisotropy of acousto-optic figure of merit: the case of Tl3AsS4 crystals

Mys Oksana; Adamenko Dmitro; Krupych Oleg; Vlokh Rostyslav

摘要

We analyze the effect of acoustic wave (AW) polarization states deviation from purely longitudinal and transverse on the anisotropy of the acousto-optic (AO) figure of merit for the case of AO interactions occurring in the principal crystallographic planes. In particular, we obtain phenomenological relations that describe the effective elasto-optic coefficient for the six types of AO interactions, which exhaust all of the possible isotropic AO diffractions. These relations are compared for the alternative cases when the deviations of polarization of the AWs from purely longitudinal and transverse ones are either taken into consideration or completely neglected. Our analysis carried out on the example of Tl3AsS4 crystals reveals that the deviation of AW polarization from its pure states influences the anisotropy of the AO figure of merit only when the AO interactions with quasitransverse AWs are dealt with. This fact is caused by the peculiar acoustic and elasto-optic properties of Tl3AsS4 . On the other hand, the situation can become different for other crystalline materials, where the angular dependences of the AO figure of merit can differ significantly in cases in which the deviation angle increases. This holds true for the AO interactions with both quasi-transverse and quasi-longitudinal AWs. Under these conditions, non-orthogonality of the AWs (or deviation from their longitudinal polarization states) affects essentially the AO characteristics. Finally, we determine the geometries of AO interactions for which the highest AO figures of merit are reached for the Tl3AsS4 crystals. (C) 2018 Optical Society of America

机译：我们分析了声波（AW）偏振态偏离纯度纵向且横向于在主要晶粒中发生的AO相互作用的情况的各向异性的各向异性偏离和横向的效果。特别地，我们获得了描述六种类型的AO相互作用的有效弹性系数的现象学关系，其排出所有可能的各向同性AO衍射。将这些关系进行比较，替代情况是当AWS的极化从纯度纵向和横向于横向和横向于偏离或完全忽略时的偏离时的替代情况。我们对TL3ASS4晶体的示例进行的分析表明，仅当与Quasitransverse AWS的AO相互作用进行处理时，AW极化从其纯各种的偏差影响了AO值的各向异性。这一事实是由TL3ASS4的特殊声学和弹性光学性质引起的。另一方面，对于其他晶体材料，情况可以变得不同，其中在偏差角增加的情况下，AO优异图的角度依赖性可以显着差异。这对于与准横向和准纵向AWS的AO相互作用保持真实。在这些条件下，AWS（或与纵向偏振态的偏差）的非正交性影响基本上是AO特征。最后，我们确定AO相互作用的几何形状，为TL3ASS4晶体达到了最高的AO图。（c）2018年光学学会

Effect of deviation from purely transverse and longitudinal polarization states of acoustic waves on the anisotropy of acousto-optic figure of merit: the case of Tl3AsS4 crystals

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