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Proceedings Paper

Two-dimensional turbulent diffusion calculations for application to atmospheric laser propagation
Author(s): Charles Lim Yee
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Paper Abstract

High power laser propagation through the turbulent atmospheric is difficult due to thermal blooming effects. Current atmospheric turbulence models assume that the turbulent structure is transported across the laser beam diameter at the mean wind speed. This frozen turbulence model is valid if the laser length is short compared to the characteristic time scale associated with the evolution of the turbulence. However, for laser systems with very long inter-pulse spacing, the turbulent structure may have sufficient time to evolve dynamically between laser pulses. The turbulent structure early in the pulse train may be quite different from the turbulent structure late in the pulse train. In this study, the results from a two dimensional code used to model the time evolution of atmospheric turbulence are presented. Calculations of the turbulent diffusion and the auto-correlation time of the turbulence as a function of eddy size and velocity structure constant are also given.

Paper Details

Date Published: 1 May 1990
PDF: 12 pages
Proc. SPIE 1221, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere, (1 May 1990); doi: 10.1117/12.18346
Show Author Affiliations
Charles Lim Yee, Lockheed Missiles & Space Co., Inc. (United States)

Published in SPIE Proceedings Vol. 1221:
Propagation of High-Energy Laser Beams Through the Earth's Atmosphere
Peter B. Ulrich; LeRoy E. Wilson, Editor(s)

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