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Proceedings Paper

Evolutionary timescales of AO-produced speckles at NIR wavelengths
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Paper Abstract

We present measurements of the evolutionary timescales of speckles around adaptive optics-corrected PSFs. We placed a SELEX SAPHIRA HgCdTe detector behind the SCExAO instrument at Subaru Telescope. We analyzed the behavior of speckles at radial distances of 2-8 λ/D away from the diffraction-limited PSF in H-band (∼1.6μm) images collected at ∼1 kHz framerates. Speckles evolve with a variety of timescales, and these have not previously been studied at near-infrared wavelengths. Ultimately we would like to image reflected-light exoplanets, which necessitates a fast speckle control loop. Based on our measurements, we calculate the parameters of an optimized control loop that would enable such observations.

Paper Details

Date Published: 26 July 2016
PDF: 9 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 990918 (26 July 2016); doi: 10.1117/12.2231926
Show Author Affiliations
Sean B. Goebel, Univ. of Hawaii (United States)
Subaru Telescope, National Astronomical Observatory of Japan (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
College of Optical Sciences, Univ. of Arizona (United States)
Astrobiology Ctr. of NINS (Japan)
Donald N. B. Hall, Univ. of Hawaii (United States)
Nemanja Jovanovic, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Macquarie Univ. (Australia)
Dani E. Atkinson, Univ. of Hawaii (United States)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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