Acousto-optic (AO) anisotropic interaction in uniaxial birefringent crystals is a widespread and versatile approach to tunable spectral filtration of light. Its principal constraints are limited values of spectral and angular bandwidth restricting the light transmission and imaging performance of AO filters. A way to overcome these drawbacks is simultaneous Bragg diffraction of two or more light beams. In this paper, we discuss and compare the main features of four available modes of anisotropic wide-aperture AO interactions in uniaxial birefringent crystals. We calculate the angular aperture, spectral resolution and other parameters and estimate the spectral image quality features related to each one. Theoretical consideration and computational modeling are carried out for tellurium dioxide (TeO₂)—the main AO crystal. Derived results are important for the development of AO imaging devices, particularly multi-channel AO tunable filters.

单轴双折射晶体中的声光 (AO) 各向异性相互作用是一种广泛且通用的可调谐光谱过滤方法。其主要限制是光谱和角带宽的有限值限制了 AO 滤光片的光传输和成像性能。克服这些缺点的一种方法是两个或多个光束的同时布喇格衍射。在本文中，我们讨论和比较了单轴双折射晶体中各向异性大孔径 AO 相互作用的四种可用模式的主要特征。我们计算角孔径、光谱分辨率等参数，并估计与每一个相关的光谱图像质量特征。对二氧化碲 (TeO ₂)——主AO晶体。推导出的结果对于 AO 成像设备的开发非常重要，尤其是多通道 AO 可调滤波器。