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Proceedings Paper

Results from the laboratory demonstration of the nonlinear curvature wavefront sensor
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Paper Abstract

In this paper we show why a non-linear curvature wavefront sensor (nlCWFS) is superior to both Shack-Hartmann wavefront sensor (SHWFS) and conventional curvature wavefront sensor (cCWFS) for sensing mV < 15 natural guide stars. We have developed an experimental setup aimed at comparing the the rms wavefront error obtained with the nlCWFS and the SHWFS. We describe our experimental setup and present results from the laboratory demonstration of the nlCWFS. The non-linear approach builds on the successful curvature wavefront sensing concept. The wavefront is reconstructed from the defocused pupil images using the Gerchberg-Saxton (GS) phase diversity algorithm. We compare results obtained from reconstructing the wavefront using a Shack-Hartmann wavefront sensor (SHWFS) and a nlCWFS for a monochromatic source. We discuss approaches to overcome non-linearity issues and discuss the challenge of using two WFSs in the same spatiotemporal control regime and the implementation of the nlCWFS on the 6.5 m MMT.

Paper Details

Date Published: 22 July 2010
PDF: 11 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773619 (22 July 2010); doi: 10.1117/12.857727
Show Author Affiliations
Mala Mateen, College of Optical Sciences, The Univ. of Arizona (United States)
Vincent Garrel, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Michael Hart, Steward Observatory, The Univ. of Arizona (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Steward Observatory, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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