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Adaptive optics with an infrared pyramid wavefront sensor
Author(s): Charlotte Z. Bond; Peter Wizinowich; Mark Chun; Dimitri Mawet; Scott Lilley; Sylvain Cetre; Nemanja Jovanovic; Jacques-Robert Delorme; Edward Wetherell; Shane Jacobson; Charles Lockhart; Eric Warmbier; James K. Wallace; Donald N. Hall; Sean Goebel; Olivier Guyon; Cedric Plantet; Guido Agapito; Christophe Giordano; Simone Esposito; Bruno Femenia-Castella
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Paper Abstract

Wavefront sensing in the infrared is highly desirable for the study of M-type stars and cool red objects, as they are sufficiently bright in the infrared to be used as the adaptive optics guide star. This aids in high contrast imaging, particularly for low mass stars where the star-to-planet brightness ratio is reduced. Here we discuss the combination of infrared detector technology with the highly sensitive Pyramid wavefront sensor (WFS) for a new generation of systems. Such sensors can extend the capabilities of current telescopes and meet the requirements for future instruments, such as those proposed for the giant segmented mirror telescopes. Here we introduce the infrared Pyramid WFS and discuss the advantages and challenges of this sensor. We present a new infrared Pyramid WFS for Keck, a key sub-system of the Keck Planet Imager and Characterizer (KPIC). The design, integration and testing is reported on, with a focus on the characterization of the SAPHIRA detector used to provide the H-band wavefront sensing. Initial results demonstrate a required effective read noise <1e at high gain.

Paper Details

Date Published: 10 July 2018
PDF: 11 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107031Z (10 July 2018); doi: 10.1117/12.2314121
Show Author Affiliations
Charlotte Z. Bond, Institute for Astronomy, Univ. of Hawaii (United States)
Peter Wizinowich, W. M. Keck Observatory (United States)
Mark Chun, Institute for Astronomy, Univ. of Hawaii (United States)
Dimitri Mawet, Caltech (United States)
Scott Lilley, W. M. Keck Observatory (United States)
Sylvain Cetre, W. M. Keck Observatory (United States)
Nemanja Jovanovic, Caltech (United States)
Jacques-Robert Delorme, Caltech (United States)
Edward Wetherell, W. M. Keck Observatory (United States)
Shane Jacobson, Institute for Astronomy, Univ. of Hawaii (United States)
Charles Lockhart, Institute for Astronomy, Univ. of Hawaii (United States)
Eric Warmbier, Institute for Astronomy, Univ. of Hawaii (United States)
James K. Wallace, Jet Propulsion Lab. (United States)
Donald N. Hall, Institute for Astronomy, Univ. of Hawaii (United States)
Sean Goebel, Institute for Astronomy, Univ. of Hawaii (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Cedric Plantet, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Guido Agapito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Christophe Giordano, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Bruno Femenia-Castella, W. M. Keck Observatory (United States)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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