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列阵平顶光束大气传输的热晕效应

Thermal Blooming Effect of Flat-Topped Laser Beam Array Propagating Through Atmosphere

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摘要

研究了热晕效应对相干合成和非相干合成的列阵平顶光束在大气中传输的影响。结果表明:当列阵平顶光束在大气中传输且存在横向风时, 光斑呈月牙状; 相干合成时, 光斑内存在多个光强峰值; 非相干合成时, 光斑内始终保持一个峰值; 相对于列阵平顶光束的相干合成, 非相干合成受热晕的影响较小; 光束阶数N越大的列阵平顶光束受热晕的影响越小, 即相对于列阵平顶光束, 列阵高斯光束(N=1)受热晕的影响更大; 光束传输效率在自由空间中随着N的增大而减小, 在大气中则随着N的增大而增大; 在大气中且功率相同时, 列阵平顶光束的传输效率优于列阵高斯光束的传输效率。

Abstract

The influence of thermal blooming effect on the flat-topped laser beam array propagating through the atmosphere is studied, where coherent beam combination and incoherent beam combination are considered. The results show that the beam spot of flat-topped laser beam array propagating through the atmosphere with cross wind is like a crescent pattern. For coherent beam combination, multiply intensity peaks exist in the beam spot. For incoherent beam combination, there is always one intensity peak. The flat-topped laser beam array for incoherent beam combination is less affected by the thermal blooming than that for coherent beam combination. The flat-topped laser beam array with larger beam order N is less affected by the thermal blooming than that with smaller one. Hence, comparing with the flat-topped laser beam array, the thermal blooming is more serious for the Gaussian beam array (N=1). With the increase of N, the propagation efficiency decreases in free space, but it increases in the atmosphere. Under the condition of the same beam power in atmosphere, the propagation efficiency of flat-topped laser beam array is better than that of Gaussian laser beam array.

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中图分类号:O436.2

DOI:10.3788/aos201939.0126020

所属栏目:“光场调控、传输及其应用”专题Ⅱ

基金项目:国家自然科学基金(61505130, 61775152)

收稿日期:2018-08-16

修改稿日期:2018-10-15

网络出版日期:2018-10-25

作者单位    点击查看

李晓庆:四川师范大学物理与电子工程学院, 四川 成都 610101
曹建勇:四川师范大学物理与电子工程学院, 四川 成都 610101四川大学物理科学与技术学院, 四川 成都 610064
丁洲林:四川师范大学物理与电子工程学院, 四川 成都 610101
季小玲:四川师范大学物理与电子工程学院, 四川 成都 610101

联系人作者:李晓庆(lixiaoqing912@sicnu.edu.cn)

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引用该论文

Li Xiaoqing,Cao Jianyong,Ding Zhoulin,Ji Xiaoling. Thermal Blooming Effect of Flat-Topped Laser Beam Array Propagating Through Atmosphere[J]. Acta Optica Sinica, 2019, 39(1): 0126020

李晓庆,曹建勇,丁洲林,季小玲. 列阵平顶光束大气传输的热晕效应[J]. 光学学报, 2019, 39(1): 0126020

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