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Proceedings Paper

NFIRAOS: TMT narrow field near-infrared facility adaptive optics
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Paper Abstract

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.

Paper Details

Date Published: 27 June 2006
PDF: 12 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62720Q (27 June 2006); doi: 10.1117/12.672337
Show Author Affiliations
Glen Herriot, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
Paul Hickson, Univ. of British Columbia (Canada)
B. L. Ellerbroek, Thirty Meter Telescope (United States)
D. A. Andersen, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
T. Davidge, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
D. A. Erickson, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
I. P. Powell, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
R. Clare, Thirty Meter Telescope (United States)
L. Gilles, Thirty Meter Telescope (United States)
C. Boyer, Thirty Meter Telescope (United States)
M. Smith, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
L. Saddlemyer, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)
J.-P. Véran, National Research Council Canada, Herzberg Institute of Astrophysics (Canada)


Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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