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TeO2是声光可调滤波器主要成像晶体,由于晶体本身在分光成像时会产生色差,漂移等问题,文中从基础理论出发,研究了TeO2晶体的旋光性对其作为声光可调滤波器时分光特性的影响,进而对其基本参数作了优化。首次对比分析了I.C.Chang理论体系与P.A.Gass修正理论体系,通过对比分析方法,得出在红外波段,两种理论体系对于超声波频率协调关系的计算结果差异较大,作者认为是I.C.Chang理论忽略晶体旋光特性所引起,因此,以P.A.Gass理论作为基础的声光可调滤波器设计方法适用于红外波段,当入射光极角小于30°时,其旋光特性对分光性能的影响较小。通过对比分析可知,设计的入射光极角应小于54.7°,这样可以保持较高的声光优值和较低水平的超声波频率;在红外波段,设计的入射光极角应小于39.2°,两频率协调关系偏差Δf较小。
TeO2 is the main imaging crystal of the acousto-optic tunable filter. Since the crystal itself will produce chromatic aberration and drift in spectroscopic imaging, starting from the basic theory, the optical rotation of TeO2 crystal is studied as the acousto-optic tunable filter Spectroscopic characteristics of the impact, and then its basic parameters have been optimized. For the first time, the theoretical system of ICChang and the system of PAGass correction were compared for the first time. By contrast analysis, it is concluded that there is a big difference between the two theoretical systems in the infrared band in terms of the harmonic frequency coordination. The author thinks that ICChang theory ignores the crystal Therefore, the design method of acousto-optic tunable filter based on PAGass theory is suitable for the infrared band. When the incident angle is less than 30 °, its optical characteristics have little influence on the spectral performance. Through comparative analysis, it can be seen that the incident angle of the designed light should be less than 54.7 ° so as to maintain a higher acousto-optic excellent value and a lower level of ultrasonic frequency. In the infrared band, the designed incident polar angle should be less than 39.2 °. The frequency coordination relationship deviation Δf is small.