论文标题
在湍流气氛中长距离传播的激光束波动
Laser beam fluctuations for long distance propagation in the turbulent atmosphere
论文作者
论文摘要
光子分布函数（PDF）的方法用于研究通过湍流大气传播的光束的波动。我们的分析涉及饱和波动的状态。重点是光束徘徊的现象以及部分连贯性对光子密度波动的影响。结果表明，流浪部分的准经典部分的大小随传播距离而减小，而量子部分则增加。我们通过光束碎片解释了这种质的差异，伴随着各个部分之间的相关性丧失。考虑相扩散器对辐照度第四刻（FM）的影响。获得的FM的明确表达表明，通信通道中噪声显着降低的可能性。扩散器将射击噪声从与三角洲相关（在空间域中）变为平滑分布。这里开发的理论用于估计相扩散器对光波动的影响。
The method of photon distribution function (PDF) is used to study fluctuations of light beams propagating through a turbulent atmosphere. Our analysis concerns the regime of saturated fluctuations. The focus is on the phenomena of beam wandering and the effect of partial coherence on photon density fluctuations. It is shown that the size of the quasiclassical part of wandering decreases with the propagation distance, while the quantum part increases. We explain this qualitative difference by beam fragmentation, which is accompanied by a loss of correlation between individual parts. The effect of the phase diffuser on the fourth moment (FM) of the irradiance is taken into account. The obtained explicit expression for the FM indicates the possibility of a significant reduction of noise in the communication channel. The diffuser changes the shot noise from delta-correlated (in the spatial domain) to smoothly distributed. The theory developed here is used to estimate the influence of the phase diffuser on light fluctuations.
