13 September 2012 Gemini South multi-conjugate adaptive optics (GeMS) laser guide star facility on-sky performance results
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Abstract
With two to three deformable mirrors, three Natural Guide Stars (NGS) and five sodium Laser Guide Stars (LGS), the Gemini Multi-Conjugate Adaptive Optics System (Gemini MCAO a.k.a. GeMS) will be the first facility-class MCAO capability to be offered for regular science observations starting in 2013A. The engineering and science commissioning phase of the project was kicked off in January 2011 when the Gemini South Laser Guide Star Facility (GS LGSF) propagated its 50W laser above the summit of Cerro Pachón, Chile. GeMS commissioning has proceeded throughout 2011 and the first half of 2012 at a pace of one 6- to 10-night run per month with a 5-month pause during the 2011 Chilean winter. This paper focuses on the LGSF-side of the project and provides an overview of the LGSF system and subsystems, their top-level specifications, design, integration with the telescope, and performance throughout commissioning and beyond. Subsystems of the GS LGSF include: (i) a diode-pumped solid-state 1.06+1.32 micron sum-frequency laser capable of producing over 50W of output power at the sodium wavelength (589nm); (ii) Beam Transfer Optics (BTO) that transport the 50W beam up the telescope, split the beam five-ways and configure the five 10W beams for projection by the Laser Launch Telescope (LLT) located behind the Gemini South 8m telescope secondary mirror; and (iii) a variety of safety systems to ensure safe laser operations for observatory personnel and equipment, neighbor observatories, as well as passing aircrafts and satellites.
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Céline d'Orgeville, Céline d'Orgeville, Sarah Diggs, Sarah Diggs, Vincent Fesquet, Vincent Fesquet, Benoit Neichel, Benoit Neichel, William Rambold, William Rambold, François Rigaut, François Rigaut, Andrew Serio, Andrew Serio, Claudio Araya, Claudio Araya, Gustavo Arriagada, Gustavo Arriagada, Rodrigo Balladares, Rodrigo Balladares, Matthieu Bec, Matthieu Bec, Maxime Boccas, Maxime Boccas, Camila Duran, Camila Duran, Angelic Ebbers, Angelic Ebbers, Ariel Lopez, Ariel Lopez, Claudio Marchant, Claudio Marchant, Eduardo Marin, Eduardo Marin, Vanessa Montes, Vanessa Montes, Cristian Moreno, Cristian Moreno, Eric Petit Vega, Eric Petit Vega, Carlos Segura, Carlos Segura, Gelys Trancho, Gelys Trancho, Chad Trujillo, Chad Trujillo, Cristian Urrutia, Cristian Urrutia, Patricio Veliz, Patricio Veliz, Tomislav Vucina, Tomislav Vucina, } "Gemini South multi-conjugate adaptive optics (GeMS) laser guide star facility on-sky performance results", Proc. SPIE 8447, Adaptive Optics Systems III, 84471Q (13 September 2012); doi: 10.1117/12.925813; https://doi.org/10.1117/12.925813
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