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The Laser Guide Star Facility for TMT: requirements overview and current status of the design

Abstract 136

Submitted by Corinne BOYER


C. Boyer (1), B. Ellerbroek (1), L. Gilles (1), J.-P. Véran (2)


(1) TMT Observatory Corp.; (2) Herzberg Institute of Astrophysics


The Laser Guide Star Facility (LGSF) system of the Thirty Meter Telescope (TMT) will generate the artificial laser guide stars required by the TMT Laser Guide Star AO systems. The LGSF will use multiple sodium lasers to generate and project several asterisms from a laser launch telescope located behind the TMT secondary mirror. In particular, the LGSF will generate the 6-guide-star asterism for the TMT Narrow Field Infrared Adaptive Optics System (NFIRAOS). In this paper, we will present the LGSF requirements, system level trade-offs, expected performance, and the current status of the design, which is based upon solid state, continuous wave, sum frequency 589 nm lasers and conventional beam transport optics.

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