Balakshy Vladimir I, Mantsevich Sergey N
Department of Physics, M.V. Lomonosov Moscow State Univresity, Vorobyevy Gory, Moscow 119991, Russia.
Appl Opt. 2009 Mar 1;48(7):C135-40. doi: 10.1364/ao.48.00c135.
Peculiarities of collinear acousto-optic interaction of a strongly divergent optical beam are examined theoretically by examples of two crystals widely used in acousto-optics: calcium molybdate (CaMoO(4)) and paratellurite (TeO(2)). These materials demonstrate essentially different diffraction characteristics because of peculiar features of optical and acousto-optic anisotropy in these crystals. The dependence of the integral diffraction efficiency and the transmission band of collinear acousto-optic filters on the optical beam divergence and acoustic power is studied. It is shown that with increasing light divergence these characteristics of the filter are worsened according to the same law, and the product of the relative bandwidth and the diffraction efficiency remains constant and independent of the optical wavelength and the acousto-optic interaction length.
以声光领域广泛使用的两种晶体——钼酸钙（CaMoO₄）和偏碲酸盐（TeO₂）为例，从理论上研究了强发散光束共线声光相互作用的特性。由于这些晶体中光学和声光各向异性的独特特性，这些材料表现出本质上不同的衍射特性。研究了共线声光滤波器的积分衍射效率和透射带对光束发散度和声功率的依赖性。结果表明，随着光发散度的增加，滤波器的这些特性按照相同规律变差，并且相对带宽与衍射效率的乘积保持恒定，且与光波长和声光相互作用长度无关。
