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Proceedings Paper

An analytic model for natural guide star widefield adaptive optics
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Paper Abstract

Wide-Field Adaptive Optics (WFAO) is an AO mode in which one deformable mirror is used to achieve modest adaptive optics correction of the atmospheric turbulence, but in a much wider field of view than classical AO. At the heart of the concept is the desire to trade image quality at the center of the field of view for better image quality at the edge of a wide field (typically ~10') and is also called Improved Seeing AO (ISAO) or Ground Layer AO (GLAO) in the literature. An analytical (Fourier domain) model allows us to rapidly derive requirements on the number, brightness and distribution of guide stars for a WFAO system running on an 8-m or 30-m telescope, as well as basic AO system requirements such as loop rate and DM actuator density. In this paper we derive the Fourier domain filter that describes WFAO and present a method for evaluating WFAO performance and sky coverage. We test our performance evaluation on a pathological case, computing the scientifically relevant metric, radius of 50\% encircled energy for a typical Cn2 profile.

Paper Details

Date Published: 25 October 2004
PDF: 8 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004);
Show Author Affiliations
Jeffrey A. Stoesz, Herzberg Institute of Astrophysics, NRC (Canada)
Univ. of Victoria (Canada)
Laurent Jolissaint, Herzberg Institute of Astrophysics, NRC (Canada)
Jean-Pierre Veran, Herzberg Institute of Astrophysics, NRC (Canada)
Jeff LeDue, Univ. of Victoria (Canada)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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