弱风条件下斜程海洋湍流中涡旋光束的传输特性

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中文摘要：光束在海洋介质中传输会极大地受到海洋湍流的影响.此外,涡旋光束轨道角动量的复用会极大地提高系统容量,因此研究涡旋光束在海洋湍流中的传输具有重要意义.在水平海洋湍流理论基础上,创新性地构建了斜程路径上海洋湍流相位屏模型,以相位结构函数为依据验证了海洋湍流相位屏的准确性,根据多相位屏法搭建准直高斯涡旋光束在海洋湍流中的上行传输链路模型.数值模拟并分析了不同天顶角、海洋湍流内外尺度及拓扑荷数等其他海洋湍流参数对准直高斯涡旋光束经海洋湍流上行传输的光强及相位分布、光束漂移、轴上闪烁指数和长曝光光斑半径的影响.结果表明:涡旋光束的拓扑荷数越小、天顶角越小,光束受到湍流的影响越大;在海洋湍流上行传输链路中,准直高斯涡旋光束的光束漂移、轴上闪烁指数及长曝光光斑半径随海洋湍流外尺度的增大而增大,且主要受传输距离的影响;理想情况下,取海洋湍流外尺度为无穷大,会高估湍流对光束的影响;由于涡旋光束的本身特性,拓扑荷数对光强及相位分布和长曝光光斑半径的影响也较为显著.

外文标题：Propagation properties of the vortex beam in the slant path of ocean turbulence under weak wind model

外文摘要：Objective In recent years,with the development of underwater laser communication,laser imaging,lidar and other technologies,many scholars have carried out extensive research on the propagation of beams in ocean turbulence.Beams propagation in ocean medium is greatly affected by ocean turbulence,and the orbital angular momentum multiplexing of the vortex beam greatly increases the system capacity,thus it is of great significance to investigate the propagation of the vortex beam in ocean turbulence.Most of the previous studies have focused on the propagation of beams through horizontal ocean turbulence.However,the beam is mostly propagated through ocean turbulence in the slant path in practical applications.Methods Based on the theory of horizontal ocean turbulence,the phase screen of ocean turbulence in the slant path is generated and compensated,the correctness of ocean turbulence phase screen in the slant path is demonstrated by phase structure function.The uplink propagation link model of collimated Gaussian vortex beam in ocean turbulence is built based on the multi-phase screen method.The intensity and phase profiles,beam wander,on-axis scintillation index and long-exposure beam radius of the collimated Gaussian vortex beam in the slant path of ocean turbulence for the values of the different zenith angle,the inner scale and the outer scale of oceanic turbulence,topological charge and other ocean turbulence parameters are numerically simulated and analyzed.Results and Discussions Two-dimensional diagram of random ocean turbulence phase screen(Fig.2(a)),and the correctness of ocean turbulence phase screen in slant path is demonstrated by phase structure function(Fig.2(b));The beam wander of collimated Gaussian vortex beam versus the propagation distance for the values of different tidal velocity of depth-averaged is simulated(Fig.6(b));The beam wander of the collimated Gaussian vortex beam versus the propagation distance for the values of different wind speed,the zenith angle and the outer scale of oceanic turbulence is simulated(Fig.7).The on-axis scintillation index of the collimated Gaussian vortex beam versus the propagation distance for the values of different inner scale and the outer scale of oceanic turbulence is simulated(Fig.8(b)).Conclusions The correctness of ocean turbulence phase screen in slant path is demonstrated by phase structure function.The uplink propagation link model of ocean turbulence is simulated by multi-phase screen method.The results show that the smaller the topological charges and the larger the inner scale and the outer scale of oceanic turbulence the vortex beam,the greater the influence of turbulence on the beam is;The beam wander,the on-axis scintillation index and the long-exposure beam radius of collimated Gaussian vortex beam increase with the increase of the outer scale of ocean turbulence.Ideally,the outer scale of ocean turbulence is taken as infinity to overestimate the effect of ocean turbulence on the beam.The beam wander and the on-axis scintillation index are mainly affected by the propagation distance in the uplink propagation of ocean turbulence;Moreover,because of the characteristics of the vortex beam,the topological charges and the long-exposure beam radius have significant effects on the intensity and phase profiles and the long-exposure beam radius.

外文关键词：

ocean opticsocean turbulence in the slant pathphase screenon-axis scintillation indexbeam wanderlong-exposure beam radius

作者：

吴鹏飞、李成毓、雷思琛、谭振坤、王姣

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作者单位：

西安理工大学自动化与信息工程学院,陕西西安 710048

西安市无线光通信与网络研究重点实验室,陕西西安 710048

西安工业大学光电工程学院,陕西西安 710021

陕西科技大学电子信息与人工智能学院,陕西西安 710021

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关键词：

海洋光学斜程海洋湍流相位屏轴上闪烁指数光束漂移长曝光光斑半径

基金：

国家自然科学基金项目国家自然科学基金项目陕西省教育厅服务地方专项计划项目陕西省科技厅重点研发计划-工业领域一般项目陕西省科协青年人才支持项目陕西省科技成果转移与推广计划项目西安市高校院所科技人员服务企业项目西安市高校院所科技人员服务企业项目西安市高校院所科技人员服务企业项目碑林区 2023年应用技术研发储备工程项目

项目编号：

620013636210131320JC0272022GY-100202201422020CGXNG-04122GXFW007422GXFW000422GXFW0050GX2342

出版年：

2024

DOI：

10.3788/IRLA20230441

红外与激光工程

中国航天科工集团公司第三研究院第八三五八研究所

红外与激光工程

CSTPCD北大核心

影响因子：0.754

ISSN：1007-2276

年,卷(期)：2024.53(2)

参考文献量26