微角分束偏光棱镜分束角的特性研究

Characteristics of splitting angles of micro-angle beam splitting polarization prisms

为了了解微角分束偏光棱镜的分束特性,根据冰洲石晶体的光学性质以及光在棱镜入射与出射介面和棱镜中的传播方向,在光正入射的条件下,分析了棱镜的分束角随工作波长的变化关系;在工作波长一定的条件下,分析了入射角对棱镜分束角大小的影响及规律;设计了实验,对制作的棱镜样品进行了实验测试。结果表明,微角分束偏光棱镜的分束角随工作波长而变,且波长越短,分束角越大;在棱镜的主截面内,入射角由-20°~20°变化时,分束角呈非线性由小变大。这一结果对于微角分束偏光棱镜的设计和使用具有实际价值。

In order to study splitting characteristics of micro-angle beam splitting polarization prisms,according to optical properties of calcite crystals,from propagation direction of the light in incident interface,exit interface,and prism internal,the relationship between splitting angle and wavelength was analyzed at normal incidence. For a certain wavelength,the influence of incident angle on beam splitting angle was analyzed. After the experiment of three prism samples,the results show that splitting angle of a micro-angle beam splitting polarization prism changes with the change of wavelength of the incident light. The shorter the wavelength,the greater the splitting angle. In the principal cross section of prism,the change range of incident angle is of-20° ~ 20° and splitting angle increases nonlinearly. The results have certain value for the design and usage of micro-angle beam splitting polarization prisms.