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Proceedings Paper

Astronomical imaging using ground-layer adaptive optics
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Paper Abstract

Over the past several years, experiments in adaptive optics involving multiple natural and Rayleigh laser guide stars have been carried out by our group at the 1.5 m Kuiper telescope and the 6.5 m MMT telescope. From open-loop data we have calculated the performance gains anticipated from ground-layer adaptive optics (GLAO) and laser tomography adaptive optics corrections. In July 2007, the GLAO control loop was closed around the focus signal from all five laser guide stars at the MMT, leading to a reduction in the measured focus mode on the laser wavefront sensor by 60%. For the first time, we expect to close the full high order GLAO control loop around the five laser beacons and a tilt star at the MMT in October 2007, where we predict image quality of < 0.2 arc seconds FWHM in K band (λ = 2.2 μm) over a 2 arc minute field. We intend to explore the image quality, stability and sensitivity of GLAO correction as a function of waveband with the science instrument PISCES. PISCES is a 1-2.5 µm imager with a field of view of 110 arc seconds, at a scale of 0.11 arc seconds per pixel. This is well matched to the expected FWHM performance of the GLAO corrected field and will be able to examine PSF non-uniformity and temporal stability across a wide field. FGD.

Paper Details

Date Published: 24 September 2007
PDF: 12 pages
Proc. SPIE 6691, Astronomical Adaptive Optics Systems and Applications III, 66910N (24 September 2007); doi: 10.1117/12.732609
Show Author Affiliations
Christoph Baranec, Steward Observatory, Univ. of Arizona (United States)
Michael Lloyd-Hart, Steward Observatory, Univ. of Arizona (United States)
N. Mark Milton, Steward Observatory, Univ. of Arizona (United States)
Thomas Stalcup, Steward Observatory, Univ. of Arizona (United States)
Miguel Snyder, Steward Observatory, Univ. of Arizona (United States)
Vidhya Vaitheeswaran, Steward Observatory, Univ. of Arizona (United States)
Don McCarthy, Steward Observatory, Univ. of Arizona (United States)
Roger Angel, Steward Observatory, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 6691:
Astronomical Adaptive Optics Systems and Applications III
Robert K. Tyson; Michael Lloyd-Hart, Editor(s)

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