Multi-object adaptive optics on-sky results with Raven

Olivier Lardière, Dave Andersen, Célia Blain, Colin Bradley, Darryl Gamroth, Kate Jackson, Przemek Lach, Reston Nash, Kim Venn, Jean Pierre Véran, Carlos Correia, Shin Oya, Yutaka Hayano, Hiroshi Terada, Yoshito Ono, Masayuki Akiyama

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

34 Citations (Scopus)


Raven is a Multi-Object Adaptive Optics (MOAO) technical and science demonstrator which had its first light at the Subaru telescope on May 13-14, 2014. Raven was built and tested at the University of Victoria AO Lab before shipping to Hawai'i. Raven includes three open loop wavefront sensors (WFSs), a central laser guide star WFS, and two independent science channels feeding light to the Subaru IRCS spectrograph. Raven supports different kinds of AO correction: SCAO, open-loop GLAO and MOAO. The MOAO mode can use different tomographic reconstructors, such as Learn-and-Apply or a model-based reconstructor. This paper presents the latest results obtained in the lab, which are consistent with simulated performance, as well as preliminary on-sky results, including echelle spectra from IRCS. Ensquared energy obtained on sky in 140mas slit is 17%, 30% and 41% for GLAO, MOAO and SCAO respectively. This result confirms that MOAO can provide a level of correction in between GLAO and SCAO, in any direction of the field of regard, regardless of the science target brightness.

Original languageEnglish
Title of host publicationAdaptive Optics Systems IV
EditorsJean-Pierre Veran, Enrico Marchetti, Laird M. Close
ISBN (Electronic)9780819496164
Publication statusPublished - 2014
EventAdaptive Optics Systems IV - Montreal, Canada
Duration: 2014 Jun 222014 Jun 27

Publication series

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


ConferenceAdaptive Optics Systems IV


  • first light
  • infrared spectroscopy
  • Multi-Object adaptive optics
  • Subaru Telescope
  • tomography


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