研究了单色光石英退偏器的退偏机理；定义了退偏度作为衡量退偏器性能的物理量。从实验上在440～920 nm的光谱范围测试了器件的退偏度，结果表明:只要器件的结构角适当，或者适当调节入射光束的截面大小，便可对某一单色线偏振光实现很好的退偏。

In this paper,the depolarization mechanism of a monochromatic light crystalline quartz depolarizer is studied. The depolarization degree, which is a physical Paramter that shows the depolarization character of a depolarizer, is defined. The depolarization degree is measured in the spectrum region of 440￣～ 920 nm.The results show that if the structural angle of the depolarizer is suitable or the size of the incident ray is suitably controlled,the best depolarization can be achieved for a linearly polarized light.