为了分析三元波片复合退偏器对单色光的退偏性能的影响, 利用穆勒矩阵和斯托克斯矢量对三元波片复合退偏器的退偏效应进行了理论分析, 推导出了单色线偏振光经过三元波片复合退偏器后出射光偏振度的表达式, 并对出射光的偏振度与各个参量的关系进行了讨论。结果表明, 这种结构能够对线偏振光实现理想退偏。当α=0rad, ω＞25rad/s时, 退偏度P＜1%。这一结果对退偏器的设计研究有重要的参考价值。

In order to analyze effect of three wave-plates compound depolarizer on depolarization of monochromatic light, theoretical analysis was made by using Muller matrix and Stokes vectors. Expression of degree of polarization (DOP) of the output light was computed after monochromatic linear depolarized light passing through a three wave-plates compound depolarizer. The relationship between various parameters and DOP was also discussed. The results show that the structure is able to be depolarized completely. When α=0rad and ω＞25rad/s, P＜1%. The result has important reference of design and research of depolarizers.