Estimation of the Turbulence and Regular Refraction Effects on Laser Beam Parameters in the Atmospheric Boundary Layer: Part 1, Coherence Length and Turbulent Broadening
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The coherence length and the degree of broadening of a laser beam under the turbulence effect are estimated from the results of remote acoustic sounding of the atmospheric boundary layer with a Volna-4M sodar. The daily average profile of the coherence length in different seasons is considered. Corrections to the effective radius of a laser beam due to turbulence and the monthly average values of these corrections are calculated. A noticeable excess of the possible broadening of the laser beam in winter above that in summer was found.
Keywords:atmosphere sounding coherence laser radiation sodar turbulence laser beam broadening
The work was performed with the use of the equipment of the Atmosphere Common Use Center of the Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences.
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