一端被限制的刃型位错和光涡旋在湍流大气中的传输特性  

Propagation characteristics of one-side limited extended edge dislocation and optical vortex in turbulent atmosphere

作　　者：高鹏慧 李京英 逯美红[1] 张竺立 GAO Penghui;LI Jingying;LU Meihong;ZHANG Zhuli(Department of Physics,Changzhi University,Changzhi 046011,China;School of Communications and Information Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710061,China;Laboratory of Optical Field Manipulations,Department of Physics,Changzhi University,Changzhi 046011,China)

机构地区：[1]长治学院物理系,山西长治046011 [2]西安邮电大学通信与信息工程学院,陕西西安710061 [3]长治学院光场调控研究所,山西长治046011

出　　处：《光学技术》2023年第5期551-557,共7页Optical Technique

基　　金：山西省高等学校科技创新项目(2022L504);山西省基础研究计划项目(202203021212169);国家自然科学基金(12204375)。

摘　　要：光束在湍流大气中传输,由于大气湍流的存在,光束的波前随着传输距离的增加将会破坏,不利于在终端对光束携带信息的提取。论文基于广义惠更斯-菲涅耳原理,以携带有一端被限制的刃型位错和光涡旋的高斯光束为研究对象,探究了湍流大气传输中一段被限制的刃型位错和光涡旋的演化行为。研究发现,由于刃型位错的弯曲度不同,随着光束传输距离的增加,一端被限制的刃型位错消失或者消失后演化为光涡旋。随着传输距离的继续增加,光束波前将会出现由大气湍流诱导产生的光涡旋。当光束传输足够远,大气湍流诱导产生的光涡旋会和刃型位错演化的光涡旋发生湮灭,或者大气湍流诱导的光涡旋之间发生湮灭。光束本身携带的光涡旋在整个传输过程中稳定传输。论文研究结果在光通信中具有重要的应用。When the beam is transmitted in turbulent atmosphere,the wavefront of the beam will be destroyed with the increase of the transmission distance due to the existence of atmospheric turbulence,which is not conducive to the extraction of the information carried by the beam at the terminal.Based on the generalized Huygens-Fresnel principle,this paper investigates the evolution behaviors of one-side limited extended edge dislocation and optical vortex in turbulent atmospheric transmission by taking Gaussian beams with the two dislocations as the research object.The results show that because of the different bending degree of the edge dislocation,with the increase of the beam transmission distance,the one-side limited extended edge dislocation will disappear or evolve into an optical vortex after disappearing.As the transmission distance continues to increase,optical vortices induced by atmospheric turbulence will appear in the wavefront of the beam,When the beam is transmitted far enough,the optical vortex induced by atmospheric turbulence and the optical vortex evolved by edge dislocation will annihilate,or annihilation will occur between the optical vortices induced by atmospheric turbulence.The optical vortex carried by the beam itself is stably transmitted throughout the transmission process.The research results of the paper have important applications in the field of optical communication.

关 键 词：光涡旋 刃型位错 湍流大气 拓扑荷 

分 类 号：TN247[电子电信—物理电子学]