基于组合Wollaston棱镜成像光谱仪的视场扩大原理分析

论述了视场扩大型成像光谱仪的核心部件——组合Wollaston棱镜的结构和分光机理；应用波法线追迹法分析了光在任意方位入射面内，以任意角入射时组合Wollaston棱镜中的波矢传播规律；推导出了光在棱镜中的传播方向及出射点坐标；给出了传播过程中e光和o光之间光程差的理论表达式；采用计算机模拟，给出了光程差随入射角和入射面方位角的变化曲线；在此基础上对组合Wollaston棱镜扩大光谱仪视场的原理进行了深入分析和讨论.上述研究对偏振干涉成像光谱技术的理论研究与技术创新，对自行设计的稳态大视场偏振干涉成像光谱 关键词： Wollaston棱镜 偏振干涉成像光谱仪 波法线追迹法 视场扩大原理

Theoretial analysis on extending the field-of-view of the imaging spectrometer based on combined Wollaston prisms

The principle of beam splitting of spectrometer based on the combination of two Wollaston prisms and a half-wave plate is presented. The propagation track of light wave in the combination is analysed by wave normal-tracing method at random incidence angle and the formulas of the path difference between the e and o wave normal are deduced. Computer simulations are carried out to explain why the combination can increase the field of view of spectrometer. The results will provide a very important theoretical basis for the study of polarization interference imaging spectrum technology and the development of static large field of view polarization interference imaging spectrometer developed by us.