光散射问题中光子轨迹的相关性
Correlations of photon trajectories in the problem of light scintillations
摘要：
应用分布函数方法描述了激光束在地球大气中的动力学特性。利用分布函数动力学方程的形式解，我们发展了一种计算闪烁指数的迭代方法（$σ^2$）。问题归结为获得光子轨迹及其相关性。结合理论计算和多次计算机积分，得到了$σ^2$的值。结果表明，$σ^2$的相当大的增长范围内的中度湍流是由于不同的轨迹的相关性。我们的方法适用于相干和部分相干光的标准推导。
英文摘要：
A distribution function approach is applied to describe the dynamics of the laser beam in the Earth atmosphere. Using a formal solution of the kinetic equation for the distribution function, we have developed an iterative scheme for calculation of the scintillation index ($σ^2$). The problem reduces to obtaining the photon trajectories and their correlations. Bringing together theoretical calculations and many-fold computer integrations, the value of $σ^2$ is obtained. It is shown that a considerable growth of $σ^2$ in the range of a moderate turbulence is due to the correlations of different trajectories. The criteria of applicability of our approach for both the coherent and partially coherent light are derived.
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