Lee, IanJalali, MunibVanasse, NeilPrezkuta, ZacharyGroff, KenRoush, JaredRogers, NathanAndrews, EstelleMoule, GrantTiemann, Bruced'Orgeville, Celine2015-12-0823-28 Jun9780819472250http://hdl.handle.net/1885/37940Lockheed Martin Coherent Technologies has developed 20 W and 50 W commercial solid-state sodium beacon Guidestar Laser Systems (GLS) for the Keck I and Gemini South telescopes, respectively. This work represents a critical step toward addressing the needThe publisher permission to archive the version was received via email on 29/11/2016. Copyright 2008 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. The citation of the paper: Lee, Ian, et al. "20 W and 50 W guidestar laser system update for the Keck I and Gemini South telescopes." SPIE Astronomical Telescopes+ Instrumentation. International Society for Optics and Photonics, Proc. of SPIE vol. 7015, 70150N, 2008.Keywords: Coherent Technologies; Critical steps; Extremely Large Telescopes; Laser oscillators; Laser systems; Lockheed Martin; Sum-frequency generators; Arctic engineering; Lasers; Optical telescopes; Sodium; Tomography; Astronomical satellites200810.1117/12.7905342016-02-24