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Proceedings Paper

Optical design challenges of NFIRAOS, the first-light adaptive optics system for TMT
Author(s): Jenny Atwood; Peter Byrnes; Glen Herriot; John Pazder; Scott Roberts
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Paper Abstract

NFIRAOS (Narrow Field InfraRed Adaptive Optics System, pronounced nefarious) is the first light adaptive optics system for the Thirty Meter Telescope (TMT). It is a near-IR, diffraction limited, multi-conjugate adaptive optics (MCAO) system that uses two deformable mirrors to correct aberrations due to atmospheric turbulence. The f/15 beam delivered by the telescope, with a two arc-minute field of view, is relayed to one of three client instrument ports. Wavefront sensing is accomplished with six high order sodium laser guide star (LGS) wavefront sensors (WFSs) and three visible natural guide star (NGS) wavefront sensors. Plus, the control system uses two tip/tilt and one focus infrared WFSs located in the instruments. In this paper, we describe several optical design challenges we have faced. The science optics have been redesigned to meet evolving specifications, and the LGS WFS design has undergone multiple iterations. We present an overview of the optical systems and design drivers, including the current state of each design.

Paper Details

Date Published: 9 September 2010
PDF: 10 pages
Proc. SPIE 7652, International Optical Design Conference 2010, 765229 (9 September 2010); doi: 10.1117/12.868936
Show Author Affiliations
Jenny Atwood, National Research Council Canada (Canada)
Peter Byrnes, National Research Council Canada (Canada)
Glen Herriot, National Research Council Canada (Canada)
John Pazder, National Research Council Canada (Canada)
Scott Roberts, National Research Council Canada (Canada)


Published in SPIE Proceedings Vol. 7652:
International Optical Design Conference 2010
Julie Bentley; Anurag Gupta; Richard N. Youngworth, Editor(s)

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