Zhang Rong, Wang Xiangzhao, Cheng Xin
Laboratory of Information Optics and Opto-Electronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Jiading, Shanghai, China.
Opt Express. 2012 Jan 16;20(2):1421-35. doi: 10.1364/OE.20.001421.
It has already been found that, in turbulent atmosphere, many partially coherent electromagnetic beams with uniform source polarization distributions can regain these distribution patterns in the far field. However, the far-zone polarization properties of beams with non-uniform source polarization distributions are not sufficiently studied and the condition for an electromagnetic beam to reconstruct its source polarization distribution in the far zone is not established. Using a type of electromagnetic anisotropic Gaussian Schell-model (GSM) beams which can have non-uniform polarization distributions on the source plane, we find that, under the influence of turbulent atmosphere, the transverse polarization distribution will finally become uniform starting with a non-uniform source polarization distribution, and the far-field degree of polarization is affected by the source intensity parameters, but not by the source spatial coherence parameters. We also find that, electromagnetic anisotropic GSM beams can regain their source polarization patterns in the far field when propagating through atmospheric turbulence if and only if, the two intensity distributions corresponding to the two orthogonal field components on the source plane are the same, or are different only for a constant parameter. The validity of this condition is unaffected by the intensity and spatial coherence profiles on the source plane.
已经发现，在湍流大气中，许多具有均匀源极化分布的部分相干电磁光束在远场中可以恢复这些分布模式。然而，源极化分布不均匀的光束的远区极化特性尚未得到充分研究，并且尚未建立电磁光束在远区重建其源极化分布的条件。使用一种在源平面上可以具有非均匀极化分布的电磁各向异性高斯谢尔模型（GSM）光束，我们发现，在湍流大气的影响下，横向极化分布最终将从非均匀的源极化分布开始变得均匀，并且远场极化度受源强度参数的影响，但不受源空间相干参数的影响。我们还发现，当且仅当源平面上两个正交场分量对应的两个强度分布相同时，或者仅在一个常数参数上不同时，电磁各向异性GSM光束在通过大气湍流传播时可以在远场中恢复其源极化模式。该条件的有效性不受源平面上强度和空间相干分布的影响。
