偏振光学中被广泛应用的Stokes参量已由单点函数扩展到两点函数，并用于研究随机电磁光束的偏振度和相干度问题。广义Stokes参量成为部分相干光学研究的一个新的热点，正逐步成为与交叉光谱密度矩阵等价的研究方法。基于广义衍射积分公式，导出了广义Stokes参量通过轴对称或非对称光学系统的传输方程，并应用Stokes参量研究随机电磁光束中完全偏振部分的偏振态(包括偏振度、偏振椭圆的方位角、椭率角)变化问题。分析了随机电磁高斯-谢尔模型光束通过双焦系统的偏振态变化规律。

Recently, the widely used Stokes parameters are generalized from one-point quantities into two-point counterparts, and used to determine the degree of polarization and degree of coherence of stochastic electromagnetic beams. On the basis of the generalized diffraction integral formula for an ABCD optical system in spatial domain, we derive a propagation law for the generalized Stokes parameters of a stochastic electromagnetic beam passing through an ABCD optical system, and use the Stokes parameters to investigate properties of the state of polarization of stochastic electromagnetic beams. As an example, we study the changes in the state of polarization of a stochastic electromagnetic Gaussian Schell-model beam propagating through a dual-focus system.