径向阵列涡旋光束在大气中的传输与扩展  

Propagation and Spreading of Radial Vortex Beam Array in Atmosphere

作　　者：骆传凯 卢芳 苗志芳 韩香娥 Luo Chuankai;Lu Fang;MiaoZhifang;Han Xiang’e(School of Physics and Optoelectronic Engineering,Xidian University,Xi'an,Shaanxi 710071,China)

机构地区：[1]西安电子科技大学物理与光电工程学院

出　　处：《光学学报》2019年第6期28-33,共6页Acta Optica Sinica

摘　　要：在高能激光合成、空间光通信及其他激光工程中的潜在应用方面,阵列涡旋光束逐渐受到人们的关注。基于多重相位屏的数值方法,研究阵列涡旋光束在von Karman湍流中的传输特性,分析了光场的演化情况。结果表明:光束传输一段距离后发生融合,融合后的光束拓扑荷与初始光场中子光束的拓扑荷相同。考虑到光斑扩展会导致拓扑荷的损失进而使得通信效率下降,分析了不同湍流和光束参量对光束相对束宽的影响。湍流强度对相对束宽影响较大,拓扑荷等其他参量均对其有不同程度的影响,相对于单束涡旋光,阵列光束具有更小的相对束宽。Vortex beam arrays have gradually gained attention because of their potential applications in high-power laser synthesis, space optical communication, and laser engineering. Based on a numerical method, namely, the multiple phase screen method, we study the propagation characteristics of a vortex beam array in von Karman turbulence and analyze the light field evolution. The results indicate that the light beam is fused after transmission over a certain distance, and the topological charge of the fused beam is the same as that of the sub-beam in the initial light field. Considering that the expansion of the spot will lead to a loss of topological charge, thereby reducing the communication efficiency, we analyze the influences of various turbulence and beam parameters on the relative beam radius. Among these parameters, turbulence intensity has a great influence on relative beam width, and the other parameters such as topological charge have different degrees of impact. The relative beam radius of the vortex beam array is smaller than that of the single vortex beam.

关 键 词：大气光学 阵列涡旋光束 相对束宽 湍流相位屏 大气湍流 

分 类 号：TN929.12[电子电信—通信与信息系统]