Two-dimensional turbulent diffusion calculations for application to atmospheric laser propagation

Charles Lim Yee

doi:10.1117/12.18346

1 May 1990 Two-dimensional turbulent diffusion calculations for application to atmospheric laser propagation

Charles Lim Yee

Proceedings Volume 1221, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere; (1990) https://doi.org/10.1117/12.18346
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

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.

Citation Download Citation

Charles Lim Yee "Two-dimensional turbulent diffusion calculations for application to atmospheric laser propagation", Proc. SPIE 1221, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere, (1 May 1990); https://doi.org/10.1117/12.18346

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