Evolutionary timescales of AO-produced speckles at NIR wavelengths

Sean B. Goebel*, Olivier Guyon, Donald N B Hall, Nemanja Jovanovic, Dani E. Atkinson

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    13 Citations (Scopus)
    69 Downloads (Pure)

    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.

    Original languageEnglish
    Title of host publicationAdaptive Optics Systems V
    EditorsEnrico Marchetti, Laird M. Close, Jean-Pierre Véran
    PublisherSPIE
    Pages1-9
    Number of pages9
    ISBN (Electronic)9781510601970
    DOIs
    Publication statusPublished - 2016
    EventAdaptive Optics Systems V - Edinburgh, United Kingdom
    Duration: 26 Jun 20161 Jul 2016

    Publication series

    NameProceedings of SPIE
    PublisherSPIE
    Volume9909
    ISSN (Print)0277-786X

    Other

    OtherAdaptive Optics Systems V
    Country/TerritoryUnited Kingdom
    CityEdinburgh
    Period26/06/161/07/16

    Keywords

    • Extreme adaptive optics
    • High-contrast imaging
    • SAPHIRA
    • SCExAO
    • Speckles

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