激光导星共孔径发射接收的偏振分光效率研究

在地平式折轴望远镜上开展自适应光学瑞利激光导星实验，研究了信标光束同孔径发射和接收偏振分光技术。基于镜面膜层复振幅反射特性，采用琼斯矩阵描述方法，建立了偏振分光物理模型，研究了共孔径发射和接收偏振耦合分光的效率问题，并与实验结果进行了比较。结果表明，由于镜面膜层对s光和p光的相位延迟差异，系统偏振分光效率随着望远镜的方位角旋转会发生周期性的变化，同时也受望远镜天顶角变化的影响。在研究光路反射镜相位延迟对往返分光效率影响规律的基础上，提出了提高地平式折轴望远镜激光导星共孔径发射和接收偏振分光效率，消除受望远镜方位角和天顶角变化影响的技术途径。

Efficiency of Polarizing Beam Splitting Scheme for Rayleigh Laser Guide Star Transmitted and Received in Common Aperture

In the experiments of Rayleigh laser guide star (LGS) for adaptive optics on altazimuth Coudé telescope, the technology of LGS launched and received in the common aperture using polarizing beam splitting scheme is researched. Based on the Jones matrix method and the reflect characteristic of coating film on mirror, the physical model of polarizing beam splitting in altazimuth Coudé telescope is built. The efficiency of beam splitting for launching and receiving is simulated with numerical method in computer and compared with experimental result. The result shows that the efficiency of polarized beam splitting is periodically varying with the azimuth or elevation of the telescope because of the phase difference between the s and p polarizing vector reflected by film on the mirrors. The factors of degrading the polarizing beam splitting efficiency are analyzed. And a technical scheme for keeping the efficiency from degrading with the azimuth or elevation varying of the telescope is presented.