部分相干涡旋光束通过大气湍流上行和下行传输的比较研究  

Comparative study of partially coherent vortex beam propagations through atmospheric turbulence along a uplink path and a downlink path

作　　者：李晋红[1,2] 吕百达[2] 

机构地区：[1]太原科技大学应用科学学院,太原030024 [2]四川大学激光物理与化学研究所,成都610064

出　　处：《物理学报》2011年第7期286-292,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10874125);太原科技大学博士科研启动基金(批准号:20102016)资助的课题~~

摘　　要：基于广义惠更斯-菲涅耳原理,以高斯-谢尔模型(GSM)涡旋光束作为典型的部分相干涡旋光束,推导出GSM涡旋光束通过大气湍流斜程传输的平均光强、均方根束宽和交叉谱密度函数的解析表达式,并用以研究了大气湍流中上行和下行对GSM涡旋光束传输和对相干涡旋的影响.结果表明,在相同条件下,GSM涡旋光束下行传输受大气湍流的影响要小于上行传输,下行传输时相干涡旋拓扑电荷守恒距离要长于上行传输.对所得结果做了物理解释.Based on the extended Huygens-Fresnel principle, the propagations of a partially coherent vortex beam through atmospheric turbulence along an uplink path and a downlink path are studied, where the Gaussian Schell-model （GSM） vortex beam is taken as a typical example of partially coherent vortex beam. The analytical expressions for the average intensity, rms width and cross-spectral density function of GSM vortex beam propagating through atmospheric turbulence along a slant path are derived and used to study the influence of atmospheric turbulence along an uplink path and a downlink path on GSM vortex beam propagation and on coherence vortex. It is shown that under the same conditions the influence of atmospheric turbulence along a downlink path on GSM vortex beam propagation is smaller than that along a uplink path, and the conservation distance of the topological charge of GSM vortex beam along a downlink path is longer than that along a uplink path. The results are explained in physics.

关 键 词：部分相干涡旋光束 相干涡旋 大气湍流 上行和下行传输 

分 类 号：O436[机械工程—光学工程]