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首页> 外文期刊>Optical engineering >Split-step approach to electromagnetic propagation through atmospheric turbulence using the modified von Karman spectrum and planar apertures
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Split-step approach to electromagnetic propagation through atmospheric turbulence using the modified von Karman spectrum and planar apertures

机译：使用改进的冯·卡曼光谱和平面孔径的分步方法通过大气湍流进行电磁传播

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摘要

The impact of atmospheric phase turbulence on Gaussian beam propagation along propagation paths of varying lengths is examined using multiple random phase screens. The work is motivated by research involving generation and encryption of acousto-optic chaos, and the interest in examining propagation of such chaotic waves through atmospheric turbulence. A phase screen technique is used to simulate perturbations to the refractive index of the medium through the propagation path. A power spectral density based on the modified von Karman spectrum model for turbulence is used to describe the random phase behavior of the medium. In recent work, results for the numerical simulation of phase turbulence over a narrow region of space implemented by placing a planar aperture representing a (narrow) random phase screen were presented. Results are presented pertinent to extended phase screens (via multiple random-phase apertures) through which an incident Gaussian beam propagates incrementally via alternate phase transmission and diffraction along the propagation path. Additionally, for profiled electromagnetic waves (such as Gaussian), the scintillation index is evaluated for extended phase turbulence, and finally, fringe visibility due to the interference of double-Gaussian beams passing through extended turbulence is examined.
机译：使用多个随机相位屏检查了大气相位湍流对高斯光束沿不同长度传播路径传播的影响。这项工作的动机是涉及声光混沌的产生和加密的研究，以及研究这种混沌波通过大气湍流传播的兴趣。使用相位屏蔽技术来模拟通过传播路径对介质折射率的扰动。基于改进的von Karman谱模型的湍流功率谱密度用于描述介质的随机相位行为。在最近的工作中，提出了通过放置代表（窄）随机相位屏幕的平面孔径实现的在狭窄空间区域内进行相位湍流数值模拟的结果。给出了与扩展相位屏幕（通过多个随机相位孔径）有关的结果，高斯光束通过交替的相位传输和沿传播路径的衍射逐步传播通过该屏幕。另外，对于异型电磁波（例如高斯），将针对扩展相位湍流评估闪烁指数，最后检查由于穿过扩展湍流的双高斯光束的干涉而引起的条纹可见性。

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