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Signatures of Turbulence in Atmospheric Laser Propagation

机译：大气激光传播中湍流的特征

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摘要

The signatures of turbulence in atmospheric laser propagation are examined, with a particular focus on the effects of non-Kolmogorov turbulence on laser scintillation and phase fluctuations. Non-Kolmogorov properties of the atmospheric index-of-refraction spectrum are outlined, and it is shown that it may be possible to reproduce these features through broadband power-law forcing of the velocity and temperature fields in turbulent flows. Numerical simulations of homogeneous isotropic turbulence subjected to power-law forcing are used to motivate a spectral model for the kinetic energy, which is then extended to address power-law forcing of passive scalars such as the temperature. A modeled non-Kolmogorov index-of-refraction spectrum for power-law forced turbulence is proposed, where the model spectrum consists of standard Kolmogorov and forcing-dominated contributions. This form could reproduce the experimentally observed signatures of atmospheric turbulence on laser propagation and it may provide insights into the origins of non-Kolmogorov turbulence in the atmosphere.
机译：检查了大气激光传播中湍流的特征，特别关注了非柯尔莫哥洛夫湍流对激光闪烁和相位波动的影响。概述了大气折射率谱的非柯尔莫哥洛夫特性，并且表明通过湍流中速度和温度场的宽带幂律强迫可以重现这些特征。均质各向同性湍流经过幂律强迫的数值模拟被用来激发动能的光谱模型，然后将其扩展到解决诸如温度之类的无源标量的幂律强迫。提出了一种用于幂律强迫湍流的模型化非Kolmogorov折射率谱，其中模型谱由标准Kolmogorov和以强迫为主的贡献组成。这种形式可以在激光传播时重现通过实验观察到的大气湍流特征，并且可以提供对大气中非柯尔莫哥罗夫湍流起源的深入了解。

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