大气湍流中部分相干光束上行和下行传输偏振特性的比较  

Comparison of polarization property of partially coherent beam between propagating along an uplink path and a downlink path in atmospheric turbulence

作　　者：柯熙政[1] 王姣[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,西安710048

出　　处：《物理学报》2015年第22期144-151,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61377080;60977054);陕西省"13115"科技统筹计划(批准号:2011KTCQ01-31);陕西省教育厅产业化培育基金(批准号:2010JC17);陕西省教育厅科研计划(批准号:2013JK1104);西安市科技成果转换基金(批准号:CX12165);陕西省自然科学基础研究计划(批准号:2013JQ8011);江苏省省级前瞻性研究专项资金(第三批)项目(批准号:BE2013088)资助的课题~~

摘　　要：以部分相干的电磁高斯-谢尔模型(electromagnetic Gaussian-Schell model,EGSM)光束为研究对象,根据相干和偏振的统一理论以及随机光束的Stokes参量,推导出EGSM光束在大气湍流中斜程传输时的偏振度(degree of polarization,Do P)和偏振方向角的表达式,研究了大气湍流中上行和下行传输时EGSM光束偏振特性的不同.研究结果表明:在相同条件下,EGSM光束下行传输时整个光场Do P的分布比上行传输要集中;下行传输时轴上点的Do P达到最大值所对应的传输距离长于上行传输.可以看出,EGSM光束沿下行路径传输时,探测器可以接收更远距离处的波束传输信息.In this article, we take partially coherent electromagnetic Gaussian-Schell model （EGSM） beam as a research object. Based on the unified theory of coherence and polarization and the generalized Stokes parameters of random electromagnetic beams, the expressions of degree of polarization （DoP） and orientation angle of EGSM beam that propagates in the slant atmospheric turbulence, are derived. And the expressions are used to investigate the difference in polarization property of EGSM beam between propagating along an uplink path and a downlink path in the atmospheric turbulence. The results show that under the same conditions, the DoP distribution of EGSM beam propagating along a downlink path is more concentrated than that along an uplink path. When EGSM beam propagates along a downlink path, the maximum DoP corresponding to the propagation distance is larger than along an uplink. Therefore, when EGSM beam propagates along a downlink path, the detector can receive beam information at the longer distances.

关 键 词：大气湍流 偏振度 偏振方向角 上行和下行传输 

分 类 号：O436.3[机械工程—光学工程] O357.5[理学—光学]