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Proceedings Paper

PCI (phase compensation instability) and minishear
Author(s): David L. Fried; Roque K. Szeto
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Paper Abstract

The phenomena of phase compensation instability (PCI) and mini-shear, i.e., the nonuniformity of the turbulent wind velocity along the propagation path, are discussed. A model is developed that describes the sections of the atmosphere in a way that allowed for the mini-shear induced fading-away of old heating patterns, previously deposited in a section. It is found that, for rather high laser power-density and high spatial frequency perturbations, there was a very pronounced and quite early onset of exponential growth of the Green's function solution, i.e., an early and clear manifestation of PCI. For lower spatial frequency perturbations and/or lower laser power densities, the long term behavior was virtually constant, i.e., there was no PCI. It is concluded that PCI could occur only if the laser-power density were high enough and if the adaptive optics could correct for high enough spatial frequencies.

Paper Details

Date Published: 1 May 1991
PDF: 17 pages
Proc. SPIE 1408, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere II, (1 May 1991); doi: 10.1117/12.43553
Show Author Affiliations
David L. Fried, Optical Sciences Co. (United States)
Roque K. Szeto, Optical Sciences Co. (United States)

Published in SPIE Proceedings Vol. 1408:
Propagation of High-Energy Laser Beams Through the Earth's Atmosphere II
Peter B. Ulrich; LeRoy E. Wilson, Editor(s)

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