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Comparison of modelled atmospheric aerosol content and its influence on high-energy laser propagation

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Author: Oosterwijk, A. · Heikamp, S. · Manders-Groot, A. · Eijk, A.M.J. van
Type:article
Date:2019
Publisher: SPIE
Source:Proceedings of SPIE - The International Society for Optical Engineering, Laser Communication and Propagation through the Atmosphere and Oceans VIII 2019, 13 August 2019 through 15 August 2019
Identifier: 871939
doi: doi:10.1117/12.2529949
ISBN: 9781510629592
Article number: 111330C
Keywords: Aerosol absorption · ANAM · HEL · LOTOS-EUROS · Atmospheric movements · High energy lasers · Laser beams · Thermal blooming · Absorption co-efficient · Aerosol modeling · ANAM · Chemical transport models · High-energy laser propagation · Mie calculations · Thermal blooming effect · Atmospheric aerosols

Abstract

Aerosol content of the atmosphere is an important factor in the propagation of high-energy laser (HEL) beams. Aerosol absorption leads to the thermal blooming effect, where the laser beam heats the air and thereby creates a diverging lens. We have used three methods to estimate the aerosol absorption coefficient: (1) a Mie calculation on experimentally determined size distributions, (2) the parametric Advanced Navy Aerosol Model (ANAM), and (3) the chemical transport model LOTOS-EUROS. Individual estimates of the absorption coefficient differ significantly, which in turn impacts greatly on the extent of thermal blooming and HEL-beam propagation. © 2019 SPIE.