Estimation of the effective beam width of axially symmetric laser beams propagating in the turbulent atmosphere using the Pointing vector streamlines
D.A. Marakasov, D.S. Rytchkov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: турбулентность, эффективный радиус, линии тока, взаимная функция когерентности, turbulence, effective beam width, streamlines, mutual coherence function
Abstract
In the given paper, using the Pointing vector streamlines, the effective beam width dependence on initial field distribution of axially symmetric laser beam, propagating in the turbulent atmosphere, is investigated. Spatial evolution of effective beam widths of ring-shaped laser beams, such as Laguerre-Gaussian and dark hollow beams was examined in comparison with Gaussian beams under condition that the beam power in transmitter aperture of an atmospheric optical system is the same for all laser beam modes studied in the paper. It was shown that in the case of medium-to-strong turbulence effective beam widths of high-order Laguerre-Gaussian and dark hollow beams can be less than effective beam width of a Gaussian beam in the atmosphere.
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