运用广义惠更斯菲涅耳原理,详细研究了部分相干涡旋光束在湍流介质中的远场传输规律。研究表明,部分相干涡旋光束的光谱相干度及光强分布与光束的拓扑电荷数、空间相对相干长度及湍流介质的折射率结构常数等因素有关。在湍流介质中,光谱相干度存在相位奇点,并且随着空间相对相干长度的增大,相干涡旋逐渐演化为强度涡旋,而湍流介质的强弱对部分相干涡旋光束的影响则相反,随着湍流介质的折射率常数的增大,强度涡旋逐渐演化为相干涡旋。

Based on the extended Huygens-Fresnel principle,the spatial correlation properties of partially coherent vortex beams in the turbulent atmosphere are studied synthetically in the paper.It is shown that the spectral degree of coherence and intensity of partially coherent vortex beams depend on topological charges,spatial relative coherence length and refractive index fluctuation et al.In the turbulent atmosphere,the spectral degree of coherence is shown to possess phase singularities,with the increase of spatial relative coherence length,coherence vortex gradually evolves into intenlsity vortex.Oppositely,with the increase of refractive index fluctuation,intensity vortex evolves into coherence vortex.