双向分束角对称的偏光分束镜设计与性能分析

为了获得分束角对称的偏光分束棱镜，在双Wollaston棱镜结构的基础上，通过合理设计棱镜左右两端晶体光轴的取向，使棱镜整体呈中心切面对称；在保证对正向入射的光对称分束的同时，对反向入射光同样可以对称分束，达到了双向对称分束的目的；在此基础上给出了晶体光轴的旋转角δ与棱镜结构角S以及与波长的关系；并分析了对633 nm设计的棱镜用于其他波长时分束角的对称性.结果表明：在±300 nm的光谱范围内，分束角的不对称度均小于0.24°.

The Principle Design and Performance Analysis of Two-way Symmetric Splitting Angle Beamsplitting Prism

With the view of obtaining symmetric splitting angle prism, on the basis of Bi-,through designing the orientation of the crystal optic axis rationally, make the prism plane-symmetry about center tangent plane; Resulting in splitting beam symmetrically not only for positive-going light, but also reverse direction light.Namely, two-way symmetrically splitting .Futher studies on the relation between rotation angle of the axis and the structure angle of the prism and wavelength, and analyse the symmetry of the splitting angle when apply the prism designed for 633 nm to other wavelength, the results indicate: the asymmetry degree of splitting angle less than 0.24°,in the spectrum range of ±300 nm.