胶合层对Rochon棱镜偏向角和光强透射比影响的研究

Rochon棱镜是激光偏光技术中最常见的一种起偏分束棱镜。Rochon棱镜胶合剂的折射率不同时，出射o、e光的光强透射比会不同。另外，胶合层的前后表面并不总是严格平行，因此其偏向角和光强透射比（或光强分束比）要异于正常情况下的值。利用偏振光学的知识和Origin软件计算分析了胶合层的折射率及前后不平行对Rochon棱镜透射比（或光强分束比）和偏向角的影响。结果表明：o、e光的透射比和Rochon棱镜的光强分束均随胶合剂折射率礼的增大而增大，且n越接近于1，其光强分束比也越接近于1；Rochon棱镜的光强分束比受胶合层倾斜角θ的影响较大，且胶合层倾斜方向不同，o、e光透射比的变化情况也不同；θ对Rochon棱镜偏向角的影响与其对o、e光透射比的影响相反。

Influence of the Cementing Layer on Deflection Angle and Light Transmissivity of Rochon Prism

Rochon prism is a familiar polarizer and beam splitter prism in laser technology. When using different refractive index of the glue, the light transmissivity is different. In addition, the two surface of the cementing layer is not always strictly parallel. And therefore its deflection angle and transmissivity is different from the value of the order. The influence of the refractive index and the non-parallel on the transmissivity and the deflection angle is researched using the knowledge of polarization optics and origin software. The result indicates that the refractive index is bigger, the transmissivity of light o, e is bigger, the splitting intensity ratio is bigger. The splitting intensity ratio of Rochon prism is strongly influenced by deflection angle 8. The different declining direction bring to the different transimissivity. The influence of 8 on deflection angle is opposite to the influence on transimissivity.