A Caltech Library Service

The laser guide star facility for the Thirty Meter Telescope

Joyce, Richard and Boyer, Corinne and Daggert, Larry and Ellerbroek, Brent and Hileman, Edward and Hunten, Mark and Liang, Ming (2006) The laser guide star facility for the Thirty Meter Telescope. In: Advances in Adaptive Optics II. Proceedings of SPIE. No.6272. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62721H. ISBN 9780819463371.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the California Institute of Technology and the University of California. This work was supported, as well, by the Canada Foundation for Innovation, the Gordon and Betty Moore Foundation, the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation, the Ontario Ministry of Research and Innovation, and the National Research Council of Canada.
Group:Thirty Meter Telescope
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
University of CaliforniaUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Subject Keywords:adaptive optics, laser guide star, TMT
Series Name:Proceedings of SPIE
Issue or Number:6272
Record Number:CaltechAUTHORS:20190521-100633617
Persistent URL:
Official Citation:Richard Joyce, Corinne Boyer, Larry Daggert, Brent Ellerbroek, Edward Hileman, Mark Hunten, and Ming Liang "The Laser Guide Star Facility for the Thirty Meter Telescope", Proc. SPIE 6272, Advances in Adaptive Optics II, 62721H (28 June 2006); doi: 10.1117/12.670070;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95636
Deposited By: Tony Diaz
Deposited On:21 May 2019 17:37
Last Modified:03 Oct 2019 21:15

Repository Staff Only: item control page