Zeng Zhihong, Luo Xiujuan, Xia Aili, Zhang Yu, Cao Bei
Appl Opt. 2015 Apr 1;54(10):2630-8. doi: 10.1364/AO.54.002630.
A simpler generalized expression of irradiance fluctuation for flat-topped beams is presented based on the Born and Rytov perturbation methods. The theoretical expression of the on-axis scintillation index in non-Kolmogorov weak atmospheric optics links is developed using the generalized von Kármán spectrum model, and using the equivalent structure constant that is different for all power-law exponents. The effect of the inner scale on the on-axis scintillation index is examined comprehensively. It is observed that flat-topped beams happen to possess smaller scintillation indices at larger inner scale. The effects of the power law, flat-topped order, source size of the fundamental Gaussian beam, propagation distance, and wavelength are also analyzed.
基于玻恩近似和瑞托夫微扰方法，给出了平顶光束辐照度起伏的一种更简单的广义表达式。利用广义冯·卡门谱模型，并使用针对所有幂律指数都不同的等效结构常数，推导了非柯尔莫哥洛夫弱大气光学链路中轴上闪烁指数的理论表达式。全面研究了内尺度对轴上闪烁指数的影响。观察到平顶光束在内尺度较大时恰好具有较小的闪烁指数。还分析了幂律、平顶阶数、基高斯光束的源尺寸、传播距离和波长的影响。
