Ju Xueping, Yang Bin, Zhang Junqiang, Yan Changxiang
Appl Opt. 2017 Nov 20;56(33):9156-9164. doi: 10.1364/AO.56.009156.
Angle errors of high-order retarders will decrease the accuracy of a channeled spectropolarimeter. This paper presents an easily implemented and widely applicable method for reducing the effects of the angle errors. First, we theoretically derive a modified reconstruction model to express and analyze the effects of the angle errors. Based on the modified reconstruction model and current reference beam calibration technique, we put forward the modified reference beam calibration technique to reduce the effects of the angle errors. This method can calculate the angle errors by employing the amplitude terms, which have been ignored in the results of the current reference beam calibration. The effectiveness of the presented method is verified by numerical simulations, which show that the demodulated deviations of polarization parameters have been reduced by one order of magnitude. Experiments are further implemented to validate the proposed method. The convenience and wide applicability of the presented method make it suitable for regular correction of the instrument, especially for the case on track.
高阶延迟器的角度误差会降低通道式光谱偏振仪的精度。本文提出了一种易于实现且广泛适用的方法来减少角度误差的影响。首先，我们从理论上推导了一个修正的重建模型，以表达和分析角度误差的影响。基于修正的重建模型和当前的参考光束校准技术，我们提出了修正的参考光束校准技术来减少角度误差的影响。该方法可以通过利用幅度项来计算角度误差，而幅度项在当前参考光束校准结果中被忽略了。数值模拟验证了所提方法的有效性，结果表明偏振参数的解调偏差降低了一个数量级。进一步开展实验以验证所提方法。所提方法的便利性和广泛适用性使其适用于仪器的常规校正，尤其是在轨情况下。
