共孔径偏振耦合分光系统中反射镜造成的相位延迟差的测量
Measurement of phase difference caused by plane mirror for laser launched and received in common aperture
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摘要: 激光信标共孔径发射接收偏振分光系统的动态相位补偿需要测量望远镜各反射镜对s光和p光的相位延迟差。利用Stokes矢量和Mueller矩阵建立了物理模型，并推导出用测得的回光功率计算相位延迟差的解析式。提出一种通过实验测量回光功率计算反射镜相位延迟差的方法，解决了在0～2p范围内唯一确定反射镜相位延迟差的问题。实际测量了两块反射镜的相位延迟差，并将测量结果用于动态相位补偿偏振分光实验，验证了该方法的正确性。分析了偏振分光棱镜、法拉第旋光器以及近似计算这3个主要的测量误差源，并估计总测量误差约为1°。Abstract: It is necessary to measure the phase difference between s wave and p wave caused by the telescope for the dynamic phase compensation of the polarizing beam splitting system of laser launched and received in common aperture. A physical model is built up by using the Mueller matrix and the Stokes vector. Based on the model, the relationship between the phase difference and the measured laser power is obtained. An experimental method is presented to calculate the phase difference of plane mirror through the measured laser power, and the way to determine the only correct value between 0～2p is figured out. The phase difference of two mirrors is measured, and the results have been applied to the polarizing beam splitting experiment with dynamic phase compensation which verifies the correctness
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