Kanseri Bhaskar, Rath Shyama, Kandpal Hem Chandra
Optical Radiation Standards, National Physical Laboratory, New Delhi, India.
Opt Lett. 2009 Mar 15;34(6):719-21. doi: 10.1364/ol.34.000719.
We report an experimental method to determine the generalized Stokes parameters for a pair of points in the cross section of an electromagnetic beam, e.g., an expanded laser beam, with the help of a Young's interferometer and a set of polarizers and quarter-wave plates. The method is investigated theoretically using the electromagnetic spectral interference law. The generalized Stokes parameters, owing to their two-point nature, determine the behavior of the single-point polarization properties of the electromagnetic beam at a field point. The present method offers a unique means to determine the two-point parameters (correlation functions) by measuring the usual Stokes parameters (intensities) and the contrast parameters (visibilities) of the beam. The method might be applicable to determine the polarization dependent changes in various optical measurements.
我们报告了一种实验方法，借助杨氏干涉仪以及一组偏振器和四分之一波片，来确定电磁光束（例如扩展激光束）横截面上一对点的广义斯托克斯参数。利用电磁频谱干涉定律对该方法进行了理论研究。由于其两点性质，广义斯托克斯参数决定了场点处电磁光束单点偏振特性的行为。本方法提供了一种独特的手段，通过测量光束的常规斯托克斯参数（强度）和对比度参数（可见度）来确定两点参数（相关函数）。该方法可能适用于确定各种光学测量中与偏振相关的变化。
