Speckles in a highly corrected adaptive optics system

Eric E. Bloemhof

doi:10.1117/12.507241

24 December 2003 Speckles in a highly corrected adaptive optics system

Eric E. Bloemhof

Proceedings Volume 5169, Astronomical Adaptive Optics Systems and Applications; (2003) https://doi.org/10.1117/12.507241
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

Citation Download Citation

Eric E. Bloemhof "Speckles in a highly corrected adaptive optics system", Proc. SPIE 5169, Astronomical Adaptive Optics Systems and Applications, (24 December 2003); https://doi.org/10.1117/12.507241

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