利用杨氏双缝和马赫曾德干涉提出一种检测随机电磁光束的广义斯托克斯参数的实验方法.部分相干光通过杨氏双缝后，用光阑、半波片和偏振片组成的马赫曾德干涉光路进行处理，检测干涉条纹的相干度和单个缝的光场强度，得到光束的交叉谱密度矩阵，进而得到光束的广义斯托克斯参数.实验结果表明，同方向偏振的光分量的空间相干度高于正交偏振方向的光分量.该方法可用于研究光束传播过程中的偏振特性和相干特性的变化.

Utilizing the Young′s double slits and MachZehnder interferometer，a experimental method was proposed to measure the generalized Stokes parameters of a random electromagnetic beam .After propagating through the Young′s double slits，the partially coherent beam was processed by a Mach–Zehnder interferometer consisting of apertures,quarterwave plates and polarizers.The electric crossspectral density matrix was obtained by detecting the coherence degree of interference fringe and the density of each single slit, so that the generalized Stokes parameters could be obtained .The experiment result shows that the spectral degree of coherence for copolarized cases is higher than that for crosspolaried cases. This method will help us determine the change of the polarization and coherence of the light in propagation by detecting the change of the generalized Stokes parameters.