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NFIRAOS: TMT narrow field near-infrared facility adaptive optics

Herriot, Glen and Hickson, Paul and Ellerbroek, B. L. and Andersen, D. A. and Davidge, T. and Erickson, D. A. and Powell, I. P. and Clare, R. and Gilles, L. and Boyer, C. and Smith, M. and Saddlemyer, L. and Véran, J.-P. (2006) NFIRAOS: TMT narrow field near-infrared facility adaptive optics. In: Advances in Adaptive Optics II. Proceedings of SPIE. No.6272. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62720Q. ISBN 9780819463371.

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Although many of the instruments planned for the TMT (Thirty Meter Telescope) have their own closely-coupled adaptive optics systems, TMT will also have a facility Adaptive Optics (AO) system, NFIRAOS, feeding three instruments on the Nasmyth platform. This Narrow-Field Infrared Adaptive Optics System, employs conventional deformable mirrors with large diameters of about 300 mm. The requirements for NFIRAOS include 1.0-2.5 microns wavelength range, 30 arcsecond diameter science field of view (FOV), excellent sky coverage, and diffraction-limited atmospheric turbulence compensation (specified at 133 nm RMS including residual telescope and science instrument errors.) The reference design for NFIRAOS includes six sodium laser guide stars over a 70 arcsecond FOV, and multiple infrared tip/tilt sensors and a natural guide star focus sensor within instruments. Larger telescopes require greater deformable mirror (DM) stroke. Although initially NFIRAOS will correct a 10 arcsecond science field, it uses two deformable mirrors in series, partly to provide sufficient stroke for atmospheric correction over the 30 m telescope aperture, but mainly to improve sky coverage by sharpening near-IR natural guide stars over a 2 arcminute diameter "technical" field. The planned upgrade to full performance includes replacing the ground-conjugated DM with a higher actuator density, and using a deformable telescope secondary mirror as a "woofer." NFIRAOS feeds three live instruments: a near-Infrared integral field Imaging spectrograph, a near-infrared echelle spectrograph, and after upgrading NFIRAOS to full multi-conjugation, a wide field (30 arcsecond) infrared camera.

Item Type:Book Section
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Smith, M.0000-0002-3321-1432
Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the California Institute of Technology and the University of California. This work was supported, as well, by the Canada Foundation for Innovation, the Gordon and Betty Moore Foundation, the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation, the Ontario Ministry of Research and Innovation, and the National Research Council of Canada.
Group:Thirty Meter Telescope
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
University of CaliforniaUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Subject Keywords:Adaptive Optics, TMT, Thirty Meter Telescope
Series Name:Proceedings of SPIE
Issue or Number:6272
Record Number:CaltechAUTHORS:20190520-152727204
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Official Citation:Glen Herriot, Paul Hickson, B. L. Ellerbroek, D. A. Andersen, T. Davidge, D. A. Erickson, I. P. Powell, R. Clare, L. Gilles, C. Boyer, M. Smith, L. Saddlemyer, and J.-P. Véran "NFIRAOS: TMT narrow field near-infrared facility adaptive optics", Proc. SPIE 6272, Advances in Adaptive Optics II, 62720Q (27 June 2006); doi: 10.1117/12.672337;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95619
Deposited By: Tony Diaz
Deposited On:20 May 2019 22:57
Last Modified:09 Mar 2020 13:19

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