| Download | - View final version: NFIRAOS - first light adaptive optics system for TMT (PDF, 403 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1051/ao4elt/201002004 |
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| Author | Search for: Herriot, Glen1; Search for: Andersen, David1; Search for: Atwood, Jennifer1; Search for: Boyer, Corinne; Search for: Byrnes, Peter1; Search for: Conan, Rod; Search for: Ellerbroek, Brent; Search for: Gilles, Luc; Search for: Hickson, Paul; Search for: Jackson, Kate; Search for: Lardière, Olivier; Search for: Véran, Jean-Pierre1; Search for: Wang, Lianqi |
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| Affiliation | - National Research Council of Canada. NRC Herzberg Institute of Astrophysics
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| Format | Text, Article |
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| Conference | 1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, June 22-26, 2009, Paris, France |
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| Abstract | NFIRAOS, the TMT Observatory's initial facility AO system will correct atmospheric turbulence with 50 per cent sky coverage at the galactic pole. It is a multi-conjugate AO system feeding science light from 0.8 to 2.5 microns wavelength to three near-IR client instruments. NFIRAOS is an order 60x60 system with two deformable mirrors optically conjugated to 0 and 11.2 km. Very low background is an important design driver: one DM is mounted on a tip/tilt platform to reduce surface count; the optics are cooled to - 30 C. NFIRAOS' real time control uses six sodium laser wavefront sensors and up to three IR natural guide star tip/tilt and/or tip/tilt/focus sensors located within each client instrument. To compensate errors arising from the variability of the sodium layer, to which extremely large telescopes are more sensitive, NFIRAOS uses innovative algorithms coupled with a pair of Truth wavefront sensors that monitors a natural star at low bandwidth. For calibration, NFIRAOS includes simulators of both natural stars at infinity and laser guide stars at varying range distance. It also includes an IR acquisition camera, and a high-speed NGS WFS for operation without lasers. |
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| Publication date | 2010-02-24 |
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| Publisher | EDP Sciences |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | e02fdbd2-0c42-4c1e-8659-c4a873427055 |
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| Record created | 2020-06-24 |
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| Record modified | 2020-07-02 |
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