Vol. 14, issue 10, article # 2

Abstract:

Multiparametric analysis of fluctuations of laser radiation propagating along the near-ground paths in a big city allowed us to state that the drastic changes in radiation characteristics are due to the intermittence of the small-scale turbulence. The alternation of quasi-regular and stochastic states of a beam under such conditions can be clearly seen when working with narrow collimated beams having the Fresnel number close to unity. Even slight increase of this parameter leads to the prevalence of the stochastic state. It has been found that the fractal structure of vortical inhomogeneities in the ground layer manifests itself in the fractal structure of radiation fluctuations. The observed phenomenon is theoretically interpreted.