为了节省稀有昂贵的冰洲石晶体材料, 实现两束偏振光的平行输出, 采用冰洲石晶体与光学玻璃组合的方法, 给出了一种新型双反射平行分束偏光镜的设计。该棱镜前后半块分别为ZBaF3玻璃、冰洲石, 并用溴代萘胶合。由理论分析可知, 选择合适的结构角, 可以实现电矢量振动方向相互垂直的两束光分别在胶合面、后端面发生全反射, 并垂直上端面平行出射。结果表明,棱镜的透射比高于80%, o光消光比优于10-5, e光消光比优于10-3。该设计在节约晶体前提下, 保证了较高的消光比和透射比, 具有较好的应用前景。

In order to save the rare iceland and output two parallel polarized beams, a new type of bireflective parallel beam splitter combined of iceland and glass was designed. Two main parts of the prism are made of iceland and optical glass, and the glue is bromonaphthalene. The theoretical analysis shows that the suitable choices of structural angles can guarantee that two polarized beams whose directions of electric vector are orthogonal can escape vertically to the same exit widow after their total reflection on cemented surface and back surface respectively. The experiments indicate that the transmittance of the prism is more than 80%, the extinction ratio of o light is better than 10-5, and that of e light is better than 10-3. Therefore, that the prism still has good performance on the premise of the less iceland and it will have more chance to be applied.