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Progress toward developing the TMT adaptive optical systems and their components

Ellerbroek, Brent and Adkins, Sean and Andersen, David and Atwood, Jenny and Boyer, Corinne and Byrnes, Peter and Conan, Rodolphe and Gilles, Luc and Herriot, Glen and Hickson, Paul and Hileman, Ed and Joyce, Dick and Leckie, Brian and Liang, Ming and Pfrommer, Thomas and Sinquin, Jean-Christophe and Véran, Jean-Pierre and Wang, Lianqi and Welle, Paul (2008) Progress toward developing the TMT adaptive optical systems and their components. In: Adaptive Optics Systems. Proceedings of SPIE. No.7015. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 70150R. ISBN 9780819472250.

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Atmospheric turbulence compensation via adaptive optics (AO) will be essential for achieving most objectives of the TMT science case. The performance requirements for the initial implementation of the observatory's facility AO system include diffraction-limited performance in the near IR with 50 per cent sky coverage at the galactic pole. This capability will be achieved via an order 60x60 multi-conjugate AO system (NFIRAOS) with two deformable mirrors optically conjugate to ranges of 0 and 12 km, six high-order wavefront sensors observing laser guide stars in the mesospheric sodium layer, and up to three low-order, IR, natural guide star wavefront sensors located within each client instrument. The associated laser guide star facility (LGSF) will consist of 3 50W class, solid state, sum frequency lasers, conventional beam transport optics, and a launch telescope located behind the TMT secondary mirror. In this paper, we report on the progress made in designing, modeling, and validating these systems and their components over the last two years. This includes work on the overall layout and detailed opto-mechanical designs of NFIRAOS and the LGSF; reliable wavefront sensing methods for use with elongated and time-varying sodium laser guide stars; developing and validating a robust tip/tilt control architecture and its components; computationally efficient algorithms for very high order wavefront control; detailed AO system modeling and performance optimization incorporating all of these effects; and a range of supporting lab/field tests and component prototyping activities at TMT partners. Further details may be found in the additional papers on each of the above topics.

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Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers. The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA) and the U.S. National Science Foundation.
Group:Thirty Meter Telescope
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
University of CaliforniaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
Subject Keywords:Extremely Large Telescopes, Adaptive Optics
Series Name:Proceedings of SPIE
Issue or Number:7015
Record Number:CaltechAUTHORS:20181217-103656849
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Official Citation:Brent Ellerbroek, Sean Adkins, David Andersen, Jenny Atwood, Corinne Boyer, Peter Byrnes, Rodolphe Conan, Luc Gilles, Glen Herriot, Paul Hickson, Ed Hileman, Dick Joyce, Brian Leckie, Ming Liang, Thomas Pfrommer, Jean-Christophe Sinquin, Jean-Pierre Veran, Lianqi Wang, Paul Welle, "Progress toward developing the TMT adaptive optical systems and their components," Proc. SPIE 7015, Adaptive Optics Systems, 70150R (7 July 2008); doi: 10.1117/12.788057
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91860
Deposited By: Tony Diaz
Deposited On:18 Dec 2018 20:02
Last Modified:03 Nov 2019 18:49

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