分振幅法偏振光斯托克斯参量测量系统

Polarimeter System of Stokes Parameters Based on Division-of-Amplitude

斯托克斯参量可全面描述光束的偏振态。设计了一个分振幅光度式斯托克斯参量测量系统,在分束镜之间加入1/4波片,使光路在同一平面上。用4个性能一致的探测器同时测量4束与斯托克斯参量有关的光束光强,用偏振片和1/4波片组合产生已知的偏振态来定标该系统,通过矩阵计算,实现快速测量光束的斯托克斯参量,从而确定光束的偏振态。实验结果表明,测量装置构建容易,调节方便。斯托克斯参量的四个分量测量实验值与理论值的偏差小于6%。

Polarized light could be described completely by Stokes Parameters. A Division-of-Amplitude Polarimeter （DOAP） system was designed, in which one quarter-wave plate was set between the lenses of Division-of-Amplitude, and then the light path was in same plane. Intensity of four light beams related to Stokes Parameters was tested by four detectors with the same performance. The system was calibrated by known polarization that combined polaroid with one quarter-wave plate. Through matrix calculation, the Stokes parameters were tested quickly and the polarization of light was work out. Experiment shows that the system is set up easily and adjusted conveniently. The deviations of four dimensions of Stokes parameters between testing value and theoretical value are less than 6%.