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Proceedings Paper

SAM: a facility GLAO instrument
Author(s): Andrei Tokovinin; Roberto Tighe; Patricio Schurter; Rolando Cantarutti; Nicole van der Bliek; Manuel Martinez; Eduardo Mondaca; Andres Montane
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Paper Abstract

The SOAR Adaptive Module (SAM) will compensate ground-layer atmospheric turbulence, improving image resolution in the visible over a 3'x3' field and increasing light concentration for spectroscopy. Ground layer compensation will be achieved by means of a UV (355nm) laser guide star (LGS), imaged at a nominal distance of 10km from the telescope, coupled to a Shack-Hartmann wave front sensor (WFS) and a bimorph deformable mirror. Unique features of SAM are: access to a collimated space for filters and ADC, two science foci, built-in turbulence simulator, flexibility to operate at LGS distances of 7 to 14 km as well as with natural guide stars (NGS), a novel APD-based two-arm tip-tilt guider, a laser launch telescope with active control on both pointing and beam transfer. We describe the main features of the design, as well as operational aspects. The goal is to produce a simple and reliable ground layer adaptive optics system. The main AO module is now in the integration and testing stage; the real-time software, the WFS, and the tip-tilt guider prototype have been tested. SAM commissioning in NGS mode is expected in 2009; the LGS mode will be completed in 2010.

Paper Details

Date Published: 14 July 2008
PDF: 11 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70154C (14 July 2008); doi: 10.1117/12.788015
Show Author Affiliations
Andrei Tokovinin, Cerro Tololo Inter-American Observatory (Chile)
Roberto Tighe, Cerro Tololo Inter-American Observatory (Chile)
Patricio Schurter, Cerro Tololo Inter-American Observatory (Chile)
Rolando Cantarutti, Cerro Tololo Inter-American Observatory (Chile)
Nicole van der Bliek, Cerro Tololo Inter-American Observatory (Chile)
Manuel Martinez, Cerro Tololo Inter-American Observatory (Chile)
Eduardo Mondaca, Cerro Tololo Inter-American Observatory (Chile)
Andres Montane, Cerro Tololo Inter-American Observatory (Chile)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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