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Proceedings Paper

The Laser Guide Star Facility for the Thirty Meter Telescope
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Paper Abstract

The Thirty Meter Telescope (TMT) will utilize adaptive optics to achieve near diffraction-limited images in the near-infrared using both natural and laser guide stars. The Laser Guide Star Facility (LGSF) will project up to eight Na laser beacons to generate guide stars in the Earth's Na layer at 90 - 110 km altitude. The LGSF will generate at least four distinct laser guide star patterns (asterisms) of different geometry and angular diameter to meet the requirements of the specific adaptive optics modules for the TMT instruments. We describe the baseline concept for this facility, which draws on the heritage from the systems being installed at the Gemini telescopes. Major subsystems include the laser itself and its enclosure, the optics for transferring the laser beams up the telescope structure and the asterism generator and launch telescope, both mounted behind the TMT secondary mirror. We also discuss operational issues, particularly the required safety interlocks, and potential future upgrades to higher laser powers and precompensation of the projected laser beacons using an uplink adaptive optics system.

Paper Details

Date Published: 28 June 2006
PDF: 13 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62721H (28 June 2006); doi: 10.1117/12.670070
Show Author Affiliations
Richard Joyce, National Optical Astronomy Observatory (United States)
Corinne Boyer, Thirty Meter Telescope Project (United States)
Larry Daggert, National Optical Astronomy Observatory (United States)
Brent Ellerbroek, Thirty Meter Telescope Project (United States)
Edward Hileman, National Optical Astronomy Observatory (United States)
Mark Hunten, National Optical Astronomy Observatory (United States)
Ming Liang, National Optical Astronomy Observatory (United States)


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

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