<title>Local coherent structures in the light field scattered by atmospheric turbulence and in the image of light source</title>

Abstract

The generalisation of phase screen model is applied for studying light scattering on atmospheric paths and extended light source image properties. The random phase at the screen by integration along a broken line between source, point on the screen and observer is obtained. The optimal position of the screen surface and its connection with altitude dependence on atmospheric turbulence is discussed. The limiting conditions for phase screen model application and some possibilities of its improving are considered. The random light field in the observing plane as a sum of light beams scattered by different parts of screen is represented. The local coherent structures, connected with each beam, are described. The random (partial averaged) correlation function for light field local properties studying is applied. The second moment of this function is calculated and its dependence on model parameters is studied. The connection between random correlation function and short exposure image of light source intensity is shown. The second moment of image intensity is studied and conditions of maximal contrast image are obtained. The approach to phase on the screen reconstruction is considered.