NFIRAOS, the Thirty Meter Telescope’s first adaptive optics system is an order 60x60 Multi-Conjugate AO system with two deformable mirrors. Although most observing will use 6 laser guide stars, it also has an NGS-only mode. Uniquely, NFIRAOS is cooled to -30 °C to reduce thermal background. NFIRAOS delivers a 2-arcminute beam to three client instruments, and relies on up to three IR WFSs in each instrument. We present recent work including: robust automated acquisition on these IR WFSs; trade-off studies for a common-size of deformable mirror; real-time computing architectures; simplified designs for high-order NGS-mode wavefront sensing; modest upgrade concepts for high-contrast imaging.
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Glen Herriot ; David Andersen ; Jenny Atwood ; Corinne Boyer ; Peter Byrnes, et al.
NFIRAOS: first facility AO system for the Thirty Meter Telescope
", Proc. SPIE 9148, Adaptive Optics Systems IV, 914810 (July 21, 2014); doi:10.1117/12.2055525; http://dx.doi.org/10.1117/12.2055525