湍流等离子体中部分相干优雅拉盖尔-高斯涡旋光束的偏振和相干特性

Labiba F. Hassan, A. Alkelly, M. Khaled
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引用次数: 0

摘要

根据扩展惠更斯-菲涅尔原理,推导了在各向异性湍流等离子体中传播的部分相干优雅拉盖尔-高斯(eLG)涡旋光束的交叉谱密度矩阵元素的解析表达式,并利用该表达式研究了湍流等离子体中部分相干eLG涡旋光束的极化度和相干度的变化。数值结果表明,部分相干 eLG 涡旋束在湍流等离子体中传播距离较长后,其偏振度会达到一个特定值(等于源平面上的偏振度)。此外,该值与光束阶数、拓扑电荷、相关系数、源面波长、各向异性参数、折射率波动方差以及湍流等离子体的内外尺度无关。结果还显示,随着距离的增加,相干度首先从统一值下降,然后在零附近振荡。然而,这种振荡会在飞行一段距离后逐渐消失。我们的结果直观地展示了各向异性高超音速湍流中光束的偏振和相干特性,这对高超音速湍流环境中的光通信非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Polarization and coherence properties of a partially coherent elegant Laguerre–Gaussian vortex beam in turbulent plasma
The analytical expressions for the cross-spectral density matrix elements of the partially coherent elegant Laguerre–Gaussian (eLG) vortex beam propagating through anisotropic turbulent plasma were derived based on the extended Huygens-Fresnel principle and used to study the changes in the polarization degree and the coherence degree of the partially coherent eLG vortex beam in the turbulent plasma. The numerical results show that the polarization degree of a partially coherent eLG vortex beam reaches a specific value (which is equal to the degree of polarization in the source plane) after a long propagation distance in the turbulent plasma. Moreover, this value is independent of the beam order, topological charge, correlation coefficient, wavelength of the source plane, anisotropy parameter, refractive index fluctuation variance, and outer and inner scales of the turbulent plasma. The results also show that with increasing distance, the coherence degree first decreases from unity and then oscillates around zero. However, this oscillation gradually disappears after traveling a long distance. Our results intuitively present the beam polarization and coherence properties through anisotropic hypersonic turbulence, which can be useful for optical communication in hypersonic turbulent environments.
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