PCI (phase compensation instability) and minishear

David L. Fried; Roque K. Szeto

doi:10.1117/12.43553

1 May 1991 PCI (phase compensation instability) and minishear

David L. Fried, Roque K. Szeto

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.

Citation Download Citation

David L. Fried and 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); https://doi.org/10.1117/12.43553

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