10 July 2008 Update on the TMT laser guide star facility design
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The Thirty Meter Telescope (TMT) will implement a Laser Guide Star Facility (LGSF), which will generate up to nine Na laser beams in at least four distinct asterisms. The TMT LGSF conceptual design is based upon three 50W solid state, continuous wave, sum frequency 589 nm lasers and conventional beam transport optics. In this paper, we provide an update to the TMT LGSF conceptual design. The LGSF top end and the beam transfer optics have been significantly redesigned to compensate for the TMT telescope top end flexure, to adapt for the new TMT Ritchey-Chretien optical design, to reduce the number of optical surfaces and to reduce the mass and volume. Finally, the laser service enclosure has been relocated within the telescope azimuth structure. This will permit the lasers to operate with a fixed gravity vector, but also requires further changes in the beam transport optical path.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Corinne Boyer, Brent Ellerbroek, Mike Gedig, Edward Hileman, Richard Joyce, Ming Liang, "Update on the TMT laser guide star facility design", Proc. SPIE 7015, Adaptive Optics Systems, 70152N (10 July 2008); doi: 10.1117/12.787603; https://doi.org/10.1117/12.787603

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