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Proceedings Paper

Performance modeling of the effects of aperture phase error, turbulence, and thermal blooming on tiled subaperture systems
Author(s): Charles L. Leakeas; Shay R. Capehart; Richard J. Bartell; Salvatore J. Cusumano; Matthew R. Whiteley
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Paper Abstract

Laser weapon systems comprised of tiled subapertures are rapidly emerging in importance in the directed energy community. Performance models of these laser weapon systems have been developed from numerical simulations of a high fidelity wave-optics code called WaveTrain which is developed by MZA Associates. System characteristics such as mutual coherence, differential jitter, and beam quality rms wavefront error are defined for a focused beam on the target. Engagement scenarios are defined for various platform and target altitudes, speeds, headings, and slant ranges along with the natural wind speed and heading. Inputs to the performance model include platform and target height and velocities, Fried coherence length, Rytov number, isoplanatic angle, thermal blooming distortion number, Greenwood and Tyler frequencies, and atmospheric transmission. The performance model fit is based on power-in-the-bucket (PIB) values against the PIB from the simulation results for the vacuum diffraction-limited spot size as the bucket. The goal is to develop robust performance models for aperture phase error, turbulence, and thermal blooming effects in tiled subaperture systems.

Paper Details

Date Published: 10 May 2011
PDF: 15 pages
Proc. SPIE 8038, Atmospheric Propagation VIII, 803803 (10 May 2011); doi: 10.1117/12.883207
Show Author Affiliations
Charles L. Leakeas, Air Force Institute of Technology (United States)
Shay R. Capehart, Air Force Institute of Technology (United States)
Richard J. Bartell, Air Force Institute of Technology (United States)
Salvatore J. Cusumano, Air Force Institute of Technology (United States)
Matthew R. Whiteley, MZA Associates Corp. (United States)

Published in SPIE Proceedings Vol. 8038:
Atmospheric Propagation VIII
Linda M. Wasiczko Thomas; Earl J. Spillar, Editor(s)

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