## Abstract

Experimental results are presented for the statistics of 0.6328-*μ*m laser irradiance fluctuations for multiple-pass propagation through a laboratory-simulated atmospheric turbulence of strength
${C}_{n}^{2}=2.476\times {10}^{-11}{\text{m}}^{-2/3}$ and the smallest scale size *l*_{0} = 2.74 mm. The coefficients of variation γ_{0}, skewness γ_{1}, and excess γ_{2} of irradiance fluctuations are plotted as a function of path length. From the plots of γ_{2} vs γ_{1} for various values of
${\sigma}_{1}^{2}\phantom{\rule{0.2em}{0ex}}(=1.23{k}^{7/6}{C}_{n}^{2}{L}^{11/6})$ 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.

© 1982 Optical Society of America

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