在消偏器工作原理的基础上,利用米勒矩阵和斯托克斯矢量,建立消偏器结构参数与光学系统偏振敏感度的一般关系。借助数值分析,当两楔形晶体光轴夹角为90°时,消偏器具有优良的消偏性能,并且光轴取向下时调整晶体厚度可进一步减小光学系统偏振敏感度。以光栅成像光谱仪为例设计消偏器,给出其性能评价。

Based on the working principle of depolarizer, the general relationship between the structural parameters of depolarizer and the polarization sensitivity of optical system is established by applying Mueller matrix and Stokes vector. With numerical analysis, it is pointed out that the depolarizer has excellent depolarization performance when the angle between the optical axes of two wedge crystals is 90°. Under this orientation, selecting proper crystal thickness can further reduce the polarization sensitivity of optical system. Finally, taking grating imaging spectrometer as an example, we design a depolarizer and evaluate its performance.