Characteristics of high-power partially coherent laser beams propagating upwards in the turbulent atmosphere.
Characteristics of high-power partially coherent laser beams propagating upwards in the turbulent atmosphere.
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DOI：
10.1364/oe.399401
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发表时间：
2020-09
期刊：
影响因子：
3.8
通讯作者：
Yu Deng;Huan Wang;X. Ji;Xiaoqing Li;Hong Yu;Lifeng Chen
中科院分区：
文献类型：
--
作者：
Yu Deng;Huan Wang;X. Ji;Xiaoqing Li;Hong Yu;Lifeng Chen
研究了高功率部分相干激光束在湍流大气中向上传输的特性，其中考虑了衍射、非线性自聚焦和湍流的主要特征。基于“薄窗”模型，利用非线性相移的二次近似，导出了传输的解析公式。结果表明，湍流效应对光束传输特性有重要影响。但增加激光仰角可以抑制湍流和自聚焦效应。激光仰角对湍流效应的影响大于对自聚焦效应的影响，对自聚焦效应的影响大于对衍射效应的影响。特别地，提出了最佳焦距和波长，以减小目标上的光束光斑尺寸。
The characteristics of high-power partially coherent laser beams propagating upwards in the turbulent atmosphere are studied, where the principal features of diffraction, nonlinear self-focusing and turbulence are considered. Based on the "thin window" model, the analytical propagation formulae are derived by using the quadratic approximation of the nonlinear phase shift. It is found that the turbulence effect plays an important role in beam propagation characteristics. But the turbulence and self-focusing effects can be suppressed by increasing the laser elevation. Furthermore, the influence of laser elevation on the turbulence effect is stronger than that on the self-focusing effect, and influence of laser elevation on the self-focusing effect is stronger than that on the diffraction effect. In particular, the optimal focal length and wavelength are proposed to decrease the beam spot size on the target.