1 May 1991 PCI (phase compensation instability) and minishear
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Proceedings Volume 1408, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere II; (1991) https://doi.org/10.1117/12.43553
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States
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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David L. Fried, David L. Fried, Roque K. Szeto, Roque K. Szeto, } "PCI (phase compensation instability) and minishear", Proc. SPIE 1408, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere II, (1 May 1991); doi: 10.1117/12.43553; https://doi.org/10.1117/12.43553
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