Changes in the statistical properties of stochastic anisotropic electromagnetic beams on propagation in the turbulent atmosphere.
Changes in the statistical properties of stochastic anisotropic electromagnetic beams on propagation in the turbulent atmosphere.
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DOI：
10.1364/oe.15.016909
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发表时间：
2007-12
期刊：
影响因子：
3.8
通讯作者：
X. Du;Daomu Zhao;O. Korotkova
中科院分区：
文献类型：
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作者：
X. Du;Daomu Zhao;O. Korotkova
我们报告了借助矢量积分在湍流大气中传播的随机电磁各向异性光束的 e 2 X2 互谱密度矩阵元素的解析公式。根据这些公式，可以确定这种光束在传播过程中的光谱密度（光谱）、偏振光谱度以及相干光谱度的变化。例如，这些量是针对在各向同性和均匀大气中传播的所谓各向异性电磁高斯谢尔模型光束计算的。特别是，数值显示，对于此类光束，与各向同性电磁高斯谢尔模型光束不同，其光谱偏振度在大气中传播足够远的距离后不会返回到其在源平面中的值。研究还表明，随着通过湍流大气的传播距离的增加，这种光束的光谱相干度趋于零，这与先前报告的各向同性光束的结果一致。
We report analytic formulas for the elements of the e 2 X2 cross-spectral density matrix of a stochastic electromagnetic anisotropic beam propagating through the turbulent atmosphere with the help of vector integration. From these formulas the changes in the spectral density (spectrum), in the spectral degree of polarization, and in the spectral degree of coherence of such a beam on propagation are determined. As an example, these quantities are calculated for a so-called anisotropic electromagnetic Gaussian Schell-model beam propagating in the isotropic and homogeneous atmosphere. In particular, it is shown numerically that for a beam of this class, unlike for an isotropic electromagnetic Gaussian Schell-model beam, its spectral degree of polarization does not return to its value in the source plane after propagating at sufficiently large distances in the atmosphere. It is also shown that the spectral degree of coherence of such a beam tends to zero with increasing distance of propagation through the turbulent atmosphere, in agreement with results previously reported for isotropic beams.