马赫-曾德尔外差干涉椭偏仪非线性误差分析

马赫-曾德尔外差干涉椭偏仪是一种重要的光偏振态实时测量技术。为了提高测量系统的精度、降低误差,采用外差干涉光路分析和数值模拟的方法,理论推导了透射式马赫-曾德尔外差干涉椭偏仪光路的误差公式。结果表明,光源偏振的椭圆化程度,偏振分光棱镜消偏比及倾斜都能引起测量误差;同误差参量下待测光束不同的椭偏比和s,p分量相位差得到的测量误差不同;马赫-曾德尔外差干涉仪的误差结果与迈克尔逊外差干涉仪相近。

Nonlinear errors of Mach-Zehnder heterodyne interferometric polarimeter

Mach-Zehnder heterodyne interferometric polarimeter can measure precisely the polarization state of light in real time. The nonlinear errors, which arise from the elliptical polarization of the laser, polarization leakage of the polarized beam splitter (PBS), and misalignment of the PBS, are analyzed. The error formula has been deduced. The simulation results show that different amplitude ratio and phase difference of the measured beam have different nonlinear error output. The error results are quite similar to the nonlinear error calculated in the Michelson heterodyne interferometer.