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Proceedings Paper

Speckles in a highly corrected adaptive optics system
Author(s): Eric E. Bloemhof
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Paper Abstract

Understanding the behavior of post-correction speckles in adaptive optics systems at very high Strehl ratio is critical to determining the ultimate effectiveness of such systems for companion searches that may eventually allow the study of extrasolar planets. Recent investigations indicate that speckles, to first order in remnant phase left by the AO system, have a strong "anomalous" component that is not included in the standard (1-S) estimates of the power in the focal plane halo. Brightness of individual anomalous speckles can exceed that of "classical" speckles by orders of magnitude, although it is expected that other unusual properties of the anomalous speckles may cause them to average away rapidly in time integrations, or be instantaneously cancelled by suitable observational techniques. For example, the anomalous speckles are also "pinned," or spatially localized, on secondary Airy maxima, causing them to be suppressed on Airy nulls; they also have zero mean over time, as well as distinct symmetry properties that might be exploited. In this paper, I explore in some detail the range of operational parameters over which anomalous speckles are problematic.

Paper Details

Date Published: 24 December 2003
PDF: 11 pages
Proc. SPIE 5169, Astronomical Adaptive Optics Systems and Applications, (24 December 2003); doi: 10.1117/12.507241
Show Author Affiliations
Eric E. Bloemhof, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5169:
Astronomical Adaptive Optics Systems and Applications
Robert K. Tyson; Michael Lloyd-Hart, Editor(s)

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