基于YVO4晶体的Rochon棱镜设计及特性分析

Design and Characteristic Analysis of YVO4 Crystal Rochon Prism

设计了一种YVO4晶体的Rochon棱镜,分析Rochon棱镜的结构角、视场角以及工作波长之间的关系,结果表明,在0.4~2.0μm波段范围内,其视场角和结构角随入射光波长的增大而减小,在0.4~0.8μm范围内,随入射光波长的变化较明显,但是在近红外波段中,随波长变化不明显.当棱镜结构角为40.2°时,Rochon棱镜具有高消光比、高透过率的特点.

A YVO4 crystal Rochon prism is designed.The relationships between Rochon prism structure angle and view field angle are studied with different wavelengths.The results show that with 0.4~2.0 μm wavelengths,the structure angle and view field angle are smaller when the wavelength is larger.In visible light,these changes are obvious according to the enhancement of wavelength.But in the near-infrared region,these changes are flat.The prism with the structure angle of 40.2° has a good extinction ratio and the transmission characteristic in both visible and near-infrared regions.