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arXiv 2005.01179physics.optics
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大气传播的拉格朗日标度律

Lagrangian Scaling Law for Atmospheric Propagation

Sophia Potoczak Bragdon, Daniel Cargill, Jacob Grosek

摘要:

提出了一种新的光束通过湍流大气传输的标度律模型,并与普通的标量随机波动光学方法进行了比较。这种方法跟踪的重要光束波前和传播的高斯形激光场的相位波前参数的演变,因为它通过大气湍流移动,假设功率守恒。与其他比例律一样,该拉格朗日比例律对光束进行了多个简化假设,以便捕获感兴趣的基本特征,同时显著降低计算的计算成本。这种拉格朗日标度律被证明可以在低到中等湍流强度下可靠地工作,每个光束传播至少产生2倍的计算速度和> 100倍的内存减少(取决于所选择的分辨率)。

英文摘要:

A new scaling law model for propagation of optical beams through atmospheric turbulence is presented and compared to a common scalar stochastic waveoptics technique. This methodology tracks the evolution of the important beam wavefront and phasefront parameters of a propagating Gaussian-shaped laser field as it moves through atmospheric turbulence, assuming a conservation of power. As with other scaling laws, this Lagrangian scaling law makes multiple simplifying assumptions about the optical beam in order to capture the essential features of interest, while significantly reducing the computational cost of calculation. This Lagrangian scaling law is shown to reliably work with low to medium turbulence strengths, producing at least a 2x computational speed-up per individual propagation of the beam and >100x memory reduction (depending on the chosen resolution).

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