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Proceedings Paper

GLAS/NAOMI: ground-layer AO at the William Herschel Telescope
Author(s): Chris Benn; Don Abrams; Tibor Agocs; Diego Cano; Tom Gregory; Juan Carlos Guerra; Olivier Martin; Tim Morris; Richard Myers; Samantha Rix; Rene Rutten; Ian Skillen; Jure Skvarč; Simon Tulloch
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Paper Abstract

GLAS is an upgrade of the William Herschel Telescope's existing natural-guide-star (NGS) AO system NAOMI to incorporate a 20-W Rayleigh laser guide star (LGS) projected to an altitude of 15 km. It is currently being commissioned on-sky, and we review here the current status of the project. GLAS/NAOMI delivers dramatic improvements in PSF in both the near-IR (AO-corrected FWHM close to the diffraction limit, >~ 0.15 arcsec) and in the optical (factor of ~ 2 reduction in FWHM). The performance is similar to that with NGS, and is consistent with predictions from modelling. The main advantage over NGS AO is the large gain in sky coverage (from ~ 1% to ~ 100% at galactic latitude 40°). GLAS provides the first on-sky demonstration of closed-loop ground-layer AO (GLAO), and is the first Rayleigh LGS AO system to be offered for general use, at any telescope.

Paper Details

Date Published: 10 July 2008
PDF: 10 pages
Proc. SPIE 7015, Adaptive Optics Systems, 701523 (10 July 2008); doi: 10.1117/12.788990
Show Author Affiliations
Chris Benn, Isaac Newton Group (Spain)
Don Abrams, Isaac Newton Group (Spain)
Tibor Agocs, Isaac Newton Group (Spain)
Diego Cano, Isaac Newton Group (Spain)
Tom Gregory, Isaac Newton Group (Spain)
Juan Carlos Guerra, Isaac Newton Group (Spain)
Olivier Martin, Isaac Newton Group (Spain)
Tim Morris, Univ. of Durham (United Kingdom)
Richard Myers, Univ. of Durham (United Kingdom)
Samantha Rix, Isaac Newton Group (Spain)
Rene Rutten, Isaac Newton Group (Spain)
Ian Skillen, Isaac Newton Group (Spain)
Jure Skvarč, Isaac Newton Group (Spain)
Simon Tulloch, Isaac Newton Group (Spain)

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

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