基于相干偏振统一理论和广义惠更斯-菲涅耳原理,研究了准均匀(QH)光束交叉偏振度(SDCP)在广义大气湍流中传输变化规律,得到光场内不同空间点之间SDCP随距离演化特征.结果显示各点偏振度(DOP)在传输中变化一致的准均匀光源,在受湍流干扰后,不同距离点对之间SDCP变化随间隔大小呈现增大和减小两个趋势,使得在某一距离处,各点对之间交叉偏振度趋于统一值,而当传输距离继续增大时,不同空间点之间交叉偏振度又显示出明显区别.光场相干度以及光强相关性也有明显不同的变化特征.所得结果揭示了光场高阶统计特性变化之间的密切联系.SDCP反映的光强波动相关的物理内涵为自由或大气空间中关联成像或偏振光通信等应用提供了理论基础.

The propagation characteristics of spectral degrees of cross-polarization (SDCP) of quasi-homogenous(QH) beams are studied based on the unified theory of coherence polarization and generalized Huygens-Fresnel principle.The characteristics of SDCP changing with propagation distance of different points in the field are obtained.The results show that the quasi- homogenous sources which have same changes of the degree of polarization（DOP）of each position point may have different changes of SDCP between two spatial points.They may increase or decrease with propagation distance increases depend on the distance of two position points due to the perturbations of turbulence,it will have the same value in a special distance,and then will deviate from each other when propagation distance increases continuously.The degree of coherence and the correlation of intensity fluctuations have different characteristics of variations.The results obtained reveal close relationship between high order statistic properties of optical beam field.The physical significance of SDCP will be the foundation of applications like correlation imaging and polarization communications in free space or atmosphere.