二氧化碲非同向声光可调谐滤波器的设计分析

在分析非同向声光可调谐滤波器器件设计理论的基础上，同时考虑声光晶体的双折射和旋光特征，分析和计算了二氧化碲声光可调谐滤波器的超声波极角θａ和入射光波极角θｉ之间的关系以及超声波频率ｆａ和光波波长λ０之间的调谐关系。

Design Analysis of Non-Collinear Acousto-Optic Tunable Filter (AOTF) of TeO_2 Crystal

Based on the analysis of the design theories for non-collinear acousto-optic tunable filter (AOTF) with consideration of the birefringence and the rotatory property of TeO2 crystal, this paper analysed and calculated the angular dependence between the acoustic polar angle θa and the incident light polar angle θi as well as the tuning relation of acoustic frequency fa with the operation wavelength λ0. The calculations show that the approximation for the birefringence and the rotatory property of interaction material leads to an error in the optimum incident angle for TeO2 more than 10%, a diviation in fa-λ0 relation from experiment results, and make the spectral resolution and angular aperture of the device to be degrade. The results abtained will provide a basis for the design of AOTF with large angular aperture.