Propagation of a Gaussian-beam wave in general anisotropic turbulence
Propagation of a Gaussian-beam wave in general anisotropic turbulence
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DOI：
10.1117/12.2061892
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
L. C. Andrews;R. Phillips;R. Crabbs
中科院分区：
文献类型：
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作者：
L. C. Andrews;R. Phillips;R. Crabbs
高斯光束波通过各向异性非Kolmogorov湍流传播的数学模型在过去已经由一些研究人员开发。在以前的出版物中，各向异性空间功率谱模型是基于这样的假设，即传播是在z方向上的，并且在整个路径中在正交xy平面中保持圆形对称。然而，在本分析中，各向异性谱模型不再基于单个各向异性参数-相反，在正交XY平面中引入两个这样的参数，使得在该平面中不再需要圆对称。此外，通过假设幂律指数变化3 < α < 4，允许偏离频谱模型中的11/3幂律行为。在目前的研究中，我们开发的理论模型光束光斑大小，空间相干性，闪烁指数是有效的，在弱辐照度波动制度，以及在深湍流，或强辐照度波动制度。这些新的结果进行了比较，来自更专门的各向异性光谱在以前的分析。
Mathematical models for a Gaussian-beam wave propagating through anisotropic non-Kolmogorov turbulence have been developed in the past by several researchers. In previous publications, the anisotropic spatial power spectrum model was based on the assumption that propagation was in the z direction with circular symmetry maintained in the orthogonal xy-plane throughout the path. In the present analysis, however, the anisotropic spectrum model is no longer based on a single anisotropy parameter—instead, two such parameters are introduced in the orthogonal xyplane so that circular symmetry in this plane is no longer required. In addition, deviations from the 11/3 power-law behavior in the spectrum model are allowed by assuming power-law index variations 3 < α < 4 . In the current study we develop theoretical models for beam spot size, spatial coherence, and scintillation index that are valid in weak irradiance fluctuation regimes as well as in deep turbulence, or strong irradiance fluctuation regimes. These new results are compared with those derived from the more specialized anisotropic spectrum used in previous analyses.