干涉因素对偏光棱镜消光比测量的影响

摘要

In order to eliminate Glan-Taylor prism transmission spectra curve fluctuation and improve the measurement accuracy of extinction ratio, the quadratic curve fitting method was adopted to confirm the extreme point position of transmission curve by using polarizing prism as analyzer. The secondary light intensity was measured. And the incident end and transmission end of prism, reflection end and exit end of the cementing layer were analyzed theoretically. Then, variation law of the transmission spectrum of prism at different angles was used to explain the degree of interference. The measurement results show that this method eliminates the wave interference effect and improves the accuracy of the extinction ratio. The results solve the measurement accuracy problem of extinction ratio of air-spaced polarization prisms, and it provides the reference to use polarizing prism correctly.%为了消除不同角度入射格兰-泰勒棱镜时透射光谱曲线波动干扰产生的影响,提高消光比测量系统的测量精度,以偏光棱镜作为检偏器,采用二次曲线拟合的方法,对透射曲线的极值点实现了精确判定.并采用二次光强测量方法,对棱镜入射端、出射端、胶合层反射及透射情况进行了理论分析,然后用不同角度入射时棱镜透射谱线的变化规律来解释其干扰发生的程度.结果表明,该方法消除了波动干扰影响,提高了测量棱镜消光比的精度.这一结果解决了空气隙型偏光棱镜消光比测量精度问题,同时对偏光棱镜的正确使用提供了参考建议.