二元双折射晶体复合光退偏性能的研究

Study of depolarization performances of white light through a dualistic birefringent crystal

为更好地分析二元双折射晶体对复合光的退偏性能,从理论上分析了二元双折射晶体光轴夹角不同以及厚度不同时复合线偏振光的退偏情况,并用实验进一步验证了单晶体退偏器和Lyot型退偏器的退偏性能。结果表明,光轴夹角的不同对于出射光的偏振度有一定影响但相对间接;材料的厚度对于出射光的偏振度有很大的影响;晶体材料厚度之比对出射光偏振度也有一定影响。这一结论为退偏振器件的设计及其使用提供了一定的理论分析和参考依据。

In order to get the depolarization performance of a dualistic birefringent crystal, the performance of white light through it with different optical axis angles and thicknesses was dicussed. A the performance of the single crystal depolarizer and the Lyot depolarizer was proved through experiments. Some conclusions are drawn as follows：there are some indirect impacts on polarization with different optical axis angles ; the thickness has a vital impact on polarization ; the ratio of the thickness has a direct impact on polarization. These conclusions can give theoretic analysis and reference to the design and application of the depolarizers.