为了解钒酸钇Wollaston棱镜的分束特性, 通过棱镜中的光路分析, 得到光束正入射时o光光束和e光光束的分束特性公式, 并用MATLAB软件拟合得到棱镜的分束特性关于入射光波长和结构角的变化关系曲线。结果表明, 对于一定结构角的棱镜, 其分束角具有明显的色散特性, 波长越短, 分束角越大, 且变化也越快, 在红外光谱范围, 波长对棱镜分束角的影响减小, 其分束角趋于稳定; 分束角的对称性受波长变化的影响较小, 应用中可以忽略。棱镜的结构角与入射光波长对棱镜的透射比均有影响, 当棱镜的结构角一定时, 透射比随入射光的波长呈振荡性变化, 且o光透射比的光谱效应更为明显。该研究可以为棱镜的设计制作和实际使用提供有价值的参考。

In order to investigate splitting properties of YVO4 Wollaston prisms, by analysis of wave propagation in the prism, the formulas of o beam and e beam at normal incidence were obtained. The curve of splitting properties of the prism changing with wavelength and structure angle was obtained by MATLAB software. The results show that for the prism with the given structure angles, the dispersion property of splitting angle is evident. The shorter the wavelength, the greater the splitting angle, the faster the change. In infrared region, the effect of incident wavelength on splitting angle reduces and splitting angle is stable. The effects of wavelength changes on the symmetry of splitting angle are so little that they can be ignored in the application. The structure angles of the prism and the incident light wavelength have effects on the transmission ratio of prism. For the given structure angles of prism, transmission ratio changes with the wavelength of incident light oscillatory. Spectral effects of o light transmission ratio are more obvious. The research provides an important and valuable reference to the design and application of YVO4 prisms.