应用光学, 2009, 30 (4): 626, 网络出版: 2010-05-31
法拉第镜旋转角的偏振分束测量法
Polarization-beam-splitter measurement of rotary angle for Faraday mirror
摘要
提出了基于偏振分束法的法拉第镜偏振旋转角的测量方法。利用非偏振分束器改变法拉第镜出射光的方向,偏振分束器将该出射光分为p光和s光,分别测量其光强,应用后续“差除和”信号处理方案消除光源波动的影响,推导出法拉第镜偏振旋转角的理论表达式。分析了起偏器的消光比非0及起偏角误差对输出结果的影响,分别是0.05729°和-0.1000°。实验验证了该方法的可行性,重复测量结果为89.68°,均方值为0.01493。
Abstract
The measurement of polarization rotary angle for faraday mirror based on polarization-beam-splitter was proposed. The orientation of the light from the faraday mirror was changed through a non-polarized beam splitter (NPBS). With a polarized beam splitter (PBS), the light reflected from NPBS was split into S light and P light. Their intensities were measured, and the theoretical expression of rotary angle was deduced after the impact of optical fluctuation is eliminated by signal processing. The influence of non-zero extinction ratio and polarized-angle error on output results was analyzed. Finally the intensities were repeatedly measured, and the average rotary angle was 89.68°, the mean square deviation of all the experimental data was 0.01493.
郝蕴琦, 李海宁, 杨坤, 孔鹏, 苏磊, 李俊丰, 陈镇平. 法拉第镜旋转角的偏振分束测量法[J]. 应用光学, 2009, 30(4): 626. HAO Yun-qi, LI Hai-ning, YANG Kun, KONG Peng, SU Lei, LI Jun-feng, CHEN Zhen-ping. Polarization-beam-splitter measurement of rotary angle for Faraday mirror[J]. Journal of Applied Optics, 2009, 30(4): 626.