偏振光器件对外差干涉仪非线性的影响

摘要

偏振光器件，如波片和偏振片等，当自身有误差或具有安装误差时．会对外差干涉仪的非线性误差产生影响。通过理论分析和试验发现了一个与传统理论不同的重要事实，即当波片和偏振片位于偏振分光镜之前和之后时，它们的误差对非线性的影响不同。如果把有误差的波片和偏振片放置在偏振分光镜前面，其误差将100％~1入非线性；如果将相同的这些光学元件安装在干涉仪里面，有可能影响非线性，但通常在高阶误差范围内。%The imperfect polarizing optics, like wave plate and polarizer etc, can affect the nonlinearity of heterodyne interferometer. Our theoretical and experimental analyses show that the same wave plate and the polarizer could affect the nonlinearity of heterodyne interferometer differently depending on where it is placed, which is contrary to general thinking. Imperfections of wave plate and the polarizer optic part would introduce nonlinearity by one hundred percent if it is set in front of the interferometer, but it would be a higher order error if the same wave plate and the polarizer are set inside the interferometer.