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Proceedings Paper

Optical scintillation of a Gaussian beam in moderate-to-strong irradiance fluctuations
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Paper Abstract

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.

Paper Details

Date Published: 3 August 1999
PDF: 9 pages
Proc. SPIE 3706, Airborne Laser Advanced Technology II, (3 August 1999); doi: 10.1117/12.356951
Show Author Affiliations
Cynthia Y. Young, Univ. of Central Florida and Florida Space Institute (United States)
Larry C. Andrews, CREOL/Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 3706:
Airborne Laser Advanced Technology II
Todd D. Steiner; Paul H. Merritt, Editor(s)

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