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Proceedings Paper

Ultra-high-sensitivity wavefront sensing for extreme-AO
Author(s): Olivier Guyon
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Paper Abstract

A new wavefront sensing scheme derived from curvature wavefront sensing is presented. Non-linear Curvature wavefront sensing (NLCWFS) is a scheme derived from conventional curvature wavefront sensing. NLCWFS uses four defocused pupil images and a non-linear wavefront reconstruction. NLCWFS is largely achromatic and does not require a flat (<1 rad RMS) wavefront to operate: it is therefore very robust, and is an attractive alternative to less efficient Shack-Hartmann wavefront sensing. For low order aberrations, sensitivity gains corresponding to 5 and 8 stellar magnitudes can be achieved over the conventional Shack-Hartmann sensor on respectively a 8-m telescope and a 30-m telescope.

Paper Details

Date Published: 10 July 2008
PDF: 10 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70151K (10 July 2008); doi: 10.1117/12.790170
Show Author Affiliations
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (NAOJ) (United States)

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

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