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3 August 1999 Optical scintillation of a Gaussian beam in moderate-to-strong irradiance fluctuations
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A model of irradiance fluctuations for a propagating optical wave in a weakly inhomogeneous medium is developed here under the assumption that small-scale irradiance fluctuations are modulated by large-scale irradiance fluctuations of the wave. The resulting scintillation index from this theory has the form (sigma) 12 equals (sigma) x2 + (sigma) y2 + (sigma) x2 (sigma) y2 where (sigma) x2 denotes large-scale scintillation and (sigma) y2 denotes small-scale scintillation. By applying a modification of the Rytov method that incorporates an amplitude spatial frequency filter function under strong fluctuation conditions, tractable expression are developed for the scintillation index of a Gaussian beam wave that are valid under moderate- to-strong irradiance fluctuations. The expected scintillation of Gaussian beams predicted by these analytic models is compared to the experimental data previously published.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Cynthia Y. Young and Larry C. Andrews "Optical scintillation of a Gaussian beam in moderate-to-strong irradiance fluctuations", Proc. SPIE 3706, Airborne Laser Advanced Technology II, (3 August 1999);

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