Zhou Guodong, Li Yanqiu, Liu Ke
Appl Opt. 2021 May 1;60(13):3623-3628. doi: 10.1364/AO.424381.
An efficient calibration method of total polarimetric errors in a channeled spectropolarimeter (CSP) is proposed and experimentally demonstrated. Total polarimetric errors, including alignment and retardance errors as well as those caused by nonideal retarders and the polarizer in CSP, are considered and calibrated. We first construct the calibrated modulation matrix of CSP by directly measuring the Mueller matrix spectrum of the polarization module in CSP. Compared to previously reported calibration works that required 1074 measurements, our calibration requires only 16 individual measurements, which reduces the measurement time by 67-fold while ensuring high accuracy with a maximum rms error less than 0.02. Further experimental test on three types of different CSP systems confirms the efficiency, reliability, and accuracy of the proposed calibration method.
提出并通过实验证明了一种用于通道光谱偏振仪（CSP）中总偏振误差的高效校准方法。考虑并校准了包括对准和延迟误差以及由CSP中非理想延迟器和偏振器引起的总偏振误差。我们首先通过直接测量CSP中偏振模块的穆勒矩阵光谱来构建CSP的校准调制矩阵。与之前报道的需要1074次测量的校准工作相比，我们的校准仅需要16次单独测量，这将测量时间减少了67倍，同时确保了高精度，最大均方根误差小于0.02。对三种不同类型的CSP系统进行的进一步实验测试证实了所提出校准方法的效率、可靠性和准确性。
