Effects of Asymmetry Atmospheric Eddies on Spreading and Wander of Bessel–Gaussian Beams in Anisotropic Turbulence
Effects of Asymmetry Atmospheric Eddies on Spreading and Wander of Bessel–Gaussian Beams in Anisotropic Turbulence
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DOI：
10.1109/jphot.2018.2842243
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发表时间：
2018-06
影响因子：
2.4
通讯作者：
Mingjian Cheng;Li-xin Guo;Jiang-ting Li;Xu Yan;R. Sun;Yang You
中科院分区：
文献类型：
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作者：
Mingjian Cheng;Li-xin Guo;Jiang-ting Li;Xu Yan;R. Sun;Yang You
研究了非对称大气涡旋对各向异性湍流中贝塞尔-高斯光束扩散和漂移的影响。结果表明，湍流各向异性导致束流在大气中的扩散和漂移均有所下降。具有较大光束形状参数η的BG光束在近距离范围内光斑尺寸较窄，在远距离范围内光斑尺寸较宽。各种湍流情况下BG光束的有效瑞利范围随光束形状参数η的减小而减小。当η大于10时，大气湍流对有效瑞利范围的影响可以忽略不计。随着拓扑电荷的增加，有效瑞利距离和波束扩展增大，波束漂移减小。波束传播主要受内尺度湍流的影响，外尺度对波束在大气中的漂移有明显影响。
The effects of asymmetry atmospheric eddies on the beam spreading and wander of Bessel–Gaussian (BG) beams in anisotropic turbulence are studied. Results show that turbulence anisotropy leads to the declines in both beam spreading and wander of BG beams in the atmosphere. A BG beam with larger beam shape parameter η has a narrower spot size in a short-distance range and a wider spot size in a long-distance range. The effective Rayleigh ranges of BG beams for every turbulent situation decrease with the beam shape parameter η. When η is larger than 10, atmospheric turbulence has a negligible effect on effective Rayleigh range. The effective Rayleigh range and beam spreading increase and beam wander decreases as topological charge increase. Beam spreading is mainly affected by turbulence inner-scale, and outer-scale evidently affects beam wander in the atmosphere.