大气湍流尺度对部分相干光传输特性的影响

发布时间：2018-03-10 11:47

本文选题：大气光学　切入点：大气湍流尺度　出处：《光子学报》2017年01期 　论文类型：期刊论文

【摘要】：本文在考虑湍流内外尺度的情况下,对部分相干高斯谢尔模型光束在大气湍流中的传输特性进行了研究.主要采用考虑湍流内外尺度的修正Von Karmon谱模型,推导了部分相干光在大气湍流中的平均光强分布、光束扩展均方根束宽和漂移方差的解析式.对比分析了不同湍流强度情况下,湍流内外尺度对部分相干光在大气湍流中水平和斜程路径上传输特性的影响.结果表明:相同条件下,光束在大气湍流中传输时,沿斜程传输时的抗湍流能力强于水平传输;相比于大气湍流内尺度,大气湍流外尺度对光束漂移影响较大,外尺度对光束扩展与光强分布的影响较小,当湍流外尺度增大时,漂移现象会越来越严重;相比于大气湍流外尺度,湍流内尺度对光束扩展与光强分布的影响较大,当内尺度减小时,光束扩展现象越来越严重,光强分布也更分散,内尺度对漂移几乎无影响.
[Abstract]:In this paper, the propagation characteristics of partially coherent Gao Si Schell model beams in atmospheric turbulence are studied with the consideration of the internal and external scales of turbulence. The modified Von Karmon spectral model considering the internal and external scales of turbulence is mainly used. The analytical formulas of the average intensity distribution of partially coherent light in atmospheric turbulence, the root mean square beam width of beam propagation and the variance of drift are derived. The effects of internal and external scales on the propagation characteristics of partially coherent light in the horizontal and oblique path of atmospheric turbulence. The results show that the anti-turbulence ability of the beam propagating along the oblique path is stronger than that of the horizontal propagation under the same conditions. Compared with the internal scale of atmospheric turbulence, the external scale of atmospheric turbulence has a greater influence on the beam drift, and the external scale has less effect on the beam expansion and intensity distribution. When the external scale of turbulence increases, the drift phenomenon will become more and more serious. Compared with the external scale of atmospheric turbulence, the internal scale of turbulence has a greater effect on the beam propagation and intensity distribution. When the internal scale decreases, the beam propagation becomes more and more serious, and the intensity distribution is more dispersed, and the internal scale has almost no effect on the drift.
【作者单位】：西安理工大学自动化与信息工程学院;
【基金】：国家自然科学基金(Nos.61377080,60977054)资助~~
【分类号】：O357.5;O435

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