论文部分内容阅读
在分析非同向声光可调谐滤波器（ＡＯＴＦ）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性，分析和计算了二氧化碲（ＴｅＯ２）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人和光波波长θ０之间的调谐关系。对０．６３２８μｍ，０．４４１６μｍ和１．０６μｍ三种波长，分别给出了取不同近似下的θａ～θｉ曲线，并具体计算了θ０＝０．６３２８μｍ时，器件的有关性能参数。结果指出，在该波长下，对晶体双折射取近似表达式和不计入晶体的旋光特性，对光波最佳入射角θｉ的选取（在θｉ小于６０°的范围内），将引入大于１０％的误差，这个误差由于涉及到是否满足动量匹配条件，因此会对器件的性能有直接的影响。本文所得结果对改善大角孔径的声光可调谐滤波器设计提供了理论依据。
Based on the analysis of the design theory of non-isotropic acousto-optic tunable filter (AOTF) device, considering the birefringence and the optical rotation characteristics of acousto-optic crystal, the effects of TeO2 acousto-optic tunable filter The relationship between the polar angle θa of the ultrasonic wave and the polar angle θi of the incident light wave, and the tuning relationship between the ultrasonic frequency λo and the wavelength θ0 of the light wave. For the three wavelengths of 0.6328μm, 0.4416μm and 1.06μm, the curves of θa ~ θi under different approximations are respectively given, and the relevant performance parameters of the device at θ0 = 0.6328μm are calculated. The results show that at this wavelength, taking the approximate expression of the crystal birefringence and the optical property not counting the crystal, the optimal incident angle θi of the light wave (in the range of θi less than 60 °) will introduce more than 10% Of the error, the error due to whether it meets the momentum matching conditions, it will have a direct impact on the performance of the device. The results obtained in this paper provide a theoretical basis for the design of acousto-optic tunable filters with high aperture.