对通过实验室模拟大气湍流传播的多程激光束辐照度波动的统计测量。

Statistical measurements of irradiance fluctuations of a multipass laser beam propagated through laboratory-simulated atmospheric turbulence.

作者信息

Majumdar A K, Gamo H

机构信息

University of California, School of Engineering, Irvine, California 92717, USA.

出版信息

Appl Opt. 1982 Jun 15;21(12):2229-35. doi: 10.1364/AO.21.002229.

DOI:10.1364/AO.21.002229

PMID:20396010

Abstract

Experimental results are presented for the statistics of 0.6328-microm laser irradiance fluctuations for multiple-pass propagation through a laboratory-simulated atmospheric turbulence of strength C(2)(n) = 2.476 x 10(-11) m(-2/3) and the smallest scale size l(0) = 2.74 mm. The coefficients of variation gamma(0), skewness gamma(1), and excess gamma(2) of irradiance fluctuations are plotted as a function of path length. From the plots of gamma(2) vs gamma(1) for various values of sigma(2)(1) (= 1.23 k(7/6) C(2)(n)L(11/6)) in different regions within the turbulence, the following forms of the probability distribution functions for the irradiance fluctuations are considered: lognormal, Rice-Nakagami, m distribution, gamma (and exponential), and K distribution. We have also demonstrated the characteristic feature of -8/3 power law behavior of power spectrum and the shift of Tatarski's peak frequency in the case of strong turbulence.

摘要

给出了0.6328微米激光辐照度涨落统计的实验结果，该激光在强度为(C^{(2)}(n)=2.476×10^{-11} m^{-2/3})且最小尺度(l_0 = 2.74)毫米的实验室模拟大气湍流中进行多程传播。辐照度涨落的变异系数(\gamma_0)、偏度(\gamma_1)和峰度(\gamma_2)被绘制为光程长度的函数。根据湍流内不同区域中各种(\sigma^{(2)}(1)( = 1.23k^{7/6}C^{(2)}(n)L^{11/6}))值下(\gamma_2)与(\gamma_1)的关系图，考虑了辐照度涨落概率分布函数的以下形式：对数正态分布、莱斯 - 中谷分布、(m)分布、伽马（及指数）分布和(K)分布。我们还展示了强湍流情况下功率谱的(-8/3)幂律行为特征以及塔塔尔斯基峰值频率的偏移。