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)
60 Downloads (Pure)


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
Number of pages9
ISBN (Electronic)9781510601970
Publication statusPublished - 2016
EventAdaptive Optics Systems V - Edinburgh, United Kingdom
Duration: 26 Jun 20161 Jul 2016

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


OtherAdaptive Optics Systems V
CountryUnited Kingdom


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

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