Qian Xianmei, Zhu Wenyue, Rao Ruizhong
The Key Laboratory of the Atmospheric Composition and Optical Radiation of Chinese Academy of Sciences, AnhuiInstitute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
Opt Express. 2009 Mar 2;17(5):3782-91. doi: 10.1364/oe.17.003782.
The propagation effects of spatially pseudo-partially coherent Gaussian Schell-model beams in atmosphere are investigated numerically. The characteristics of beam spreading, beam wandering and intensity scintillation are analyzed respectively. It is found that the degradation of degree of source coherence may cause reductions of relative beam spreading and scintillation index, which indicates that partially coherent beams are more resistant to atmospheric turbulence than fully coherent beams. And beam wandering is not much sensitive to the change of source coherence. However, a partially coherent beam have a larger spreading than the fully coherent beam both in free space and in atmospheric turbulence. The influences of changing frequency of random phase screen which models the source coherence on the final intensity pattern are also discussed.
数值研究了空间伪部分相干高斯谢尔模型光束在大气中的传输效应。分别分析了光束扩展、光束漂移和强度闪烁的特性。研究发现，源相干度的降低可能会导致相对光束扩展和闪烁指数减小，这表明部分相干光束比完全相干光束更能抵抗大气湍流。并且光束漂移对源相干度的变化不太敏感。然而，部分相干光束在自由空间和大气湍流中都比完全相干光束有更大的扩展。还讨论了模拟源相干度的随机相位屏变化频率对最终强度分布的影响。
