为了节省冰洲石晶体材料、并实现偏光棱镜光路的直角分束, 采用冰洲石晶体与氟化钡晶体二元复合的方案, 设计了一种冰洲石-氟化钡紫外直角分束偏光镜。以波长为265.6nm的紫外光为例给出了设计实例。从理论上分析了入射光经过该偏光棱镜后, e光、o光的分束角和光强分束比随入射角及入射光波长的关系, 并通过计算软件作出关系曲线图。结果表明, 该偏光棱镜分束角与直角偏差小, e光、o光的光强分束比约为1∶1; 在240nm~400nm的波段范围内, 垂直入射对应的直角分束偏差小于1.0°, 光强分束比与1的偏差在0.02以内, 具有较宽的光谱适用范围。该研究对直角分束棱镜的设计、制作以及实际使用提供了有价值的参考。

In order to save calcite crystal material and realize rectangular beam splitting of the polarized prism optical path, a calcite-BaF2 ultraviolet rectangular beam splitting polarizing prism was designed by combining calcite and barium fluoride crystal. Ultraviolet light at the wavelength of 265.6nm was chosen as design example. The relationships of splitting angle of e Light and o light, splitting intensity ratio, incident angle and the wavelength of incident light, after incident light passing through the polarizing prism, were analyzed theoretically. And the relationship curve was drawn by the computing software. The results show that the splitting angle and right angle of the polarized prism is small. Light intensity splitting ratio of e light and o light is about 1∶1. In the wavelength range of 240nm~400nm, the deviation of right angle beam splitting is less than 1.0° and the deviation of light intensity splitting ratio and 1 is less than 0.02. The prism has a wide light spectrum scope of application. The research provides an important and valuable reference to design, manufacture and application of rectangular beam splitting prisms.