湍流大气中高稳定性全庞加莱球光束模式选择(特邀)  

Selection of full Poincarébeams with higher robustness in turbulent atmosphere(Invited)

作　　者：刘雪婷 翟焱望 付时尧 高春清[1,2,3] Liu Xueting;Zhai Yanwang;Fu Shiyao;Gao Chunqing(School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Information Photonics Technology,Ministry of Industry and Information Technology,Beijing 100081,China;Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]信息光子技术工业和信息化部重点实验室,北京100081 [3]光电成像技术与系统教育部重点实验室,北京100081

出　　处：《红外与激光工程》2021年第9期70-80,共11页Infrared and Laser Engineering

基　　金：国家自然科学基金(11834001,61905012);国防基础科研计划(JCKY2020602C007)。

摘　　要：作为新型结构光束的一类,全庞加莱球光束因其横截面上自旋角动量和轨道角动量发生耦合,近年来在自由空间光通信领域内受到广泛关注。然而,传输信道中的大气湍流将产生诸如光束扩展、漂移、光强闪烁等严重影响,进而限制光通信系统性能。结合随机相位屏,对具有"C"型偏振奇点的全庞加莱球光束、"V"型偏振奇点的柱矢量光束和均匀偏振的标量涡旋光束在湍流大气中的传播进行大量的数值模拟。归一化光强相关系数和模式纯度被用于研究杂合庞加莱球表面不同位置处表征的全庞加莱球的稳定性。结果表明,相较于具有相似偏振拓扑荷和光强分布的柱矢量光束以及标量涡旋光束而言,坐标位于南半球的全庞加莱球光束在弱湍流和中湍流(r0=0.5 m,0.125 m)下具有较高稳定性。而在强湍流下(r0=0.056 m),优势区域缩小至2σ∈[-5π/32,0](纬度坐标)。上述结果将为自由空间远距离通信中传输介质的选取提供重要依据并进一步促进通信质量的提升。Full Poincarébeams,as a more complicated class of novel structural beams,lead to impressive demonstrations recently in Free-Space Optical Communication(FSOC)due to the coupling of spin and orbital angular momentum in the cross section.However,a noteworthy limiting factor of FSOC system in this process is the varying atmospheric turbulence which results in beam expansion,drift,light intensity scintillation and other severe effects.Massive numerical simulations on turbulent atmospheric propagation of full Poincarébeams with C-point polarization,cylindrical vector beams with V-point polarization and homogeneous scalar polarized vortex beams through random phase screens were demonstrated.In this process,normalized correlation coefficient and mode purity were proposed to explore the robustness of full Poincarébeams on different locations of hybrid-order Poincarésphere.The results show that full Poincarébeams with coordinates located in the southern hemisphere remain high robustness under weak and moderate turbulence(r0=0.5 m,0.125 m)compared with cylindrical vector beams and scalar vortex beams with similar topological charges and intensity distribution.While the dominant area shrinks to 2σ∈[-5π/32,0](latitude coordinates)under strong turbulence(r0=0.056 m).These results will promote the selection of robust transmission media and the development of transmission quality in free-space communications with long-distance.

关 键 词：全庞加莱球光束 大气湍流 高稳定性 杂合庞加莱球 

分 类 号：O43[机械工程—光学工程]