基于微扰法研究涡旋光束在大气中传输的热晕效应  

The thermal blooming effect of vortex beam propagation in the atmosphere is studied by perturbation method

作　　者：赵璐 王静 郭苗军 李晋红[1] 徐翔 钱仙妹[2] 朱文越[2] ZHAO Lu;WANG Jing;GUO Miao-jun;LI Jin-hong;XU Xiang;QIAN Xian-mei;ZHU Wen-yue(School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China;Key laboratory of Atmospheric Optics,Anhui IrivStitute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]太原科技大学应用科学学院,山西太原030024 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,中国科学院大气光学重点实验室,安徽合肥230031

出　　处：《光电子．激光》2021年第5期532-540,共9页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(11904253);中国科学院大气光学重点实验室开放课题基金(HTAD-JJ-19-02);山西省优秀青年基金(201801D211006);山西省‘1331工程’重点创新团队建设计划(1331KIRT);山西省高等学校科技创新项目(2019L0646,2020L0368);太原科技大学科研启动基金(20192004,20202013);山西省中央引导地方科技发展资金资助项目。

摘　　要：基于一阶微扰法,推导了涡旋光束在大气中传输的稳态热晕解析表达式,并得到了由热晕引起的涡旋光束的相位畸变表达式。通过数值模拟涡旋光束在大气中传输的光强等值线分布,详细分析了传输距离、初始功率、横向风速、大气吸收系数和初始半径对涡旋光束热晕的影响。研究结果表明,在其他参数不变的情况下,单一增大涡旋光束的初始功率、传输距离和大气吸收系数,热晕效应会增强;相反,单一增大初始半径和横向风速反而会减小热晕效应。在有风的情况下,由于热晕作用,涡旋光束会向来风方向偏折,峰值强度发生移动,形成不对称的分布,且涡旋光束在沿风向和垂直风向的相位变化有所不同。所得结果对高功率激光在大气传输中的应用与高能激光器的发展具有重要的指导意义。Based on the first-order perturbation method,the analytical expression of steady-state thermal blooming for the propagation of vortex beam in the atmosphere is derived,and the phase distortion expression of vortex beam caused by thermal blooming is obtained.Through numerical simulation of intensity distribution of vortex beam propagation in the atmosphere,the effects of propagation distance,initial power,transverse wind speed,atmospheric absorption coefficient and initial radius on thermal blooming of vortex beam are analyzed in detail.The results show that the thermal blooming effect can be enhanced by increasing the initial power,propagation distance and atmospheric absorption coefficient of vortex beam without changing other parameters.On the contrary,increasing the initial radius and transverse wind speed can reduce the thermal blooming effect without changing other parameters.Moreover,In the presence of transverse winds,due to the thermal blooming effect,the vortex beam always bends in the direction of wind,and the position of peak intensity shifts,forming an asymmetric distribution.The phase distortion of vortex beam caused by thermal blooming along wind direction and vertical direction is different.The results have important guiding significance for the application of high power laser in atmospheric propagation and the development of high energy laser.

关 键 词：微扰法 大气传输 涡旋光束 热晕 

分 类 号：TN929.12[电子电信—通信与信息系统]