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Atmospheric and Oceanic Optics

2016 year, number 11

Numerical analysis of the evolution of phase fluctuations of a light field at the entrance aperture of an adaptive optics system

L.V. Antoshkin, V.V. Lavrinov, L.N. Lavrinova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: датчик волнового фронта Шэка-Гартмана, модель турбулентности, скорость ветра, Shack-Hartmann wavefront sensor, turbulence model, wind speed

Abstract

The paper presents a new algorithm for generating random phase screens, which are used in the numerical solution of the problem of laser radiation propagation in a turbulent atmosphere. Developed on the basis of this algorithm, a numerical model of the evolution of phase fluctuations of a light field at the entrance aperture of an adaptive optics system allows us to estimate the temporal transformation of atmospheric inhomogeneities, which include small-scale wind fluctuations, which occur in the real atmosphere, along with the wind transfer of turbulent inhomogeneities. Using this numerical model, a correlation method for calculation of the speed of the crosswind turbulence transfer from measurements of a wavefront Shack-Hartmann sensor is analyzed.