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10 July 2008 GLAS/NAOMI: ground-layer AO at the William Herschel Telescope
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and Simon Tulloch "GLAS/NAOMI: ground-layer AO at the William Herschel Telescope", Proc. SPIE 7015, Adaptive Optics Systems, 701523 (10 July 2008);


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