27 January 2004 Optimization of laser propagation for extensive atmospheric paths in conditions of thermal blooming
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Abstract
Numerical results of a propagation of the CW laser radiation for extensive slightly elevated atmospheric paths are presented in the paper. The calculations are carried out in the limits of the small-angle equation for the coherence function of the second order describing the partially coherent beam self-action. To solve the equation a new ray-tracing technique creating an effective numerical algorithm was used. The gas absorption was taken into account in frameworks of the average seasonal summer model of an atmosphere. The average cyclic and the volcanic models of an atmosphere were used for aerosol attenuation. High-altitude vertical profiles of turbulent fluctuations of a refractive index were determined for the best, average and worst turbulent conditions. Calculations were obtained for the radiation sources located at altitudes from 10 Km up to 25 Km. Paths up to 500 Km were considered. Let's note, that it is necessary to take into account the influence of the Earth surface curvature for these paths. To studying the problem of a minimization of an atmosphere influence on an energy transfer as a numerical criterion was selected the effective power density: Ieff = P/Seff, where P is a power of radiation at the reception plane, Seff is an effective square of a beam at the reception plane. The initial power, the initial beam focusing and the wavelength of radiation were optimized.
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Vadim V Dudorov, Vadim V Dudorov, Valeriy V Kolosov, Valeriy V Kolosov, } "Optimization of laser propagation for extensive atmospheric paths in conditions of thermal blooming", Proc. SPIE 5160, Free-Space Laser Communication and Active Laser Illumination III, (27 January 2004); doi: 10.1117/12.505018; https://doi.org/10.1117/12.505018
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