Adaptive optics with an infrared pyramid wavefront sensor

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

doi:10.1117/12.2314121

10 July 2018 Adaptive optics with an infrared pyramid wavefront sensor

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

Author Affiliations +

Proceedings Volume 10703, Adaptive Optics Systems VI; 107031Z (2018) https://doi.org/10.1117/12.2314121
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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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, and Bruno Femenia-Castella "Adaptive optics with an infrared pyramid wavefront sensor", Proc. SPIE 10703, Adaptive Optics Systems VI, 107031Z (10 July 2018); https://doi.org/10.1117/12.2314121

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