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 EspositoBruno Femenia-Castella

Research output: Chapter in Book/Report/Conference proceedingConference contribution

34 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems VI
EditorsDirk Schmidt, Laura Schreiber, Laird M. Close
ISBN (Print)9781510619593
StatePublished - 2018
EventAdaptive Optics Systems VI 2018 - Austin, United States
Duration: Jun 10 2018Jun 15 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherAdaptive Optics Systems VI 2018
Country/TerritoryUnited States


  • Pyramid wavefront sensor
  • Wavefront sensing
  • adaptive optics
  • infrared

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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