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Proceedings Paper

Adaptive optics performance comparisons for various phase reconstruction algorithms
Author(s): Thomas R. Brown; Timothy L. Berkopec
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Paper Abstract

In Airborne Laser (ABL) like systems, the phase information is typically reconstructed from wavefront tilt sensor data using a least-squares approach. The solution to the phase reconstruction problem provides a smooth unwrapped phase surface that is not necessarily equal to the original wrapped phase surface in an optical propagation sense. Still, the computed phase surface furnishes information that can be used in determining the required phase conjugation for partial correction of an atmospherically distorted laser source. In this paper, we examine the effect of two phase reconstruction algorithms; unweighted least-squares and intensity weighted least-squares on the performance of an idealized ABL-like adaptive optics systems under ABL-like atmospheric conditions. The performance of each phase reconstruction algorithm will be investigated using MZA's Airborne Laser Simulation under atmospheres with Rytov numbers ranging from 0.233 to 3.725. Since the unwrapping process creates a phase surface without the 2(pi) discontinuities of the original phase, the r0 and phase variance can be calculated from the unwrapped phase. These predictors of the phase correlation performance will be related to the performance measures; Strehl and power-in- the-bucket at the target.

Paper Details

Date Published: 8 September 1998
PDF: 11 pages
Proc. SPIE 3381, Airborne Laser Advanced Technology, (8 September 1998); doi: 10.1117/12.323932
Show Author Affiliations
Thomas R. Brown, MZA Associates Corp. (United States)
Timothy L. Berkopec, MZA Associates Corp. (United States)

Published in SPIE Proceedings Vol. 3381:
Airborne Laser Advanced Technology
Todd D. Steiner; Paul H. Merritt, Editor(s)

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