Gebhardt F G, Smith D C, Buser R G, Rohde R S
Appl Opt. 1973 Aug 1;12(8):1794-805. doi: 10.1364/AO.12.001794.
Theoretical and experimental studies have been carried out to determine the importance of mechanical turbulence, i.e., velocity fluctuations, on the propagation of high power cw CO(2) laser radiation in the atmosphere. The experimental results were obtained using artificially generated turbulence and show, in agreement with theory based on a diffusion model, that the turbulence tends to replace the asymmetric bending, focusing, and spreading by the mean wind with a symmetric blooming. For sufficiently strong velocity fluctuations, say, greater than two to three times the mean velocity, the turbulence can reduce thermal blooming effects and increase the beam irradiance. Smaller turbulence levels, however, may actually result in decreasing the beam irradiance somewhat. From these results and estimates of the properties of turbulent diffusion in the atmosphere it appears that under typical conditions the mechanical turbulence will not significantly reduce the wind-dominated thermal distortion effects.
已经开展了理论和实验研究，以确定机械湍流（即速度波动）对高功率连续波CO(2)激光辐射在大气中传播的重要性。实验结果是利用人工产生的湍流获得的，并且与基于扩散模型的理论一致，结果表明湍流倾向于用对称的光束扩展取代由平均风引起的不对称弯曲、聚焦和扩展。对于足够强的速度波动，比如大于平均速度的两到三倍，湍流可以减少热晕效应并增加光束辐照度。然而，较小的湍流水平实际上可能会导致光束辐照度有所降低。根据这些结果以及对大气中湍流扩散特性的估计，在典型条件下，机械湍流似乎不会显著降低以风为主导的热畸变效应。
