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Proceedings Paper

Comparison of LGS wavefront-sensing with pyramid, yaw, and quad-cell types wavefront sensors
Author(s): E. Gendron; D. Gratadour
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Paper Abstract

LGS wavefront sensing is a topic of importance for future ELTs. However, the elongation effect makes this task particularly difficult on a large apertures, and require large format detectors. An alternative solution is to use quad-cell types wavefront sensors : either shack-hartmann, or pyramid (using only 4 pixels per phase measurement), or yaw (an optical differentiation wavefront sensor proposed recently, also using 4 pixels, like the pyramid). We compare the performance of these devices and we develop a common model of operation, so that their behavior can be directly compared and their differences easily enlightened.

Paper Details

Date Published: 13 September 2012
PDF: 10 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844713 (13 September 2012); doi: 10.1117/12.925558
Show Author Affiliations
E. Gendron, LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris Diderot (France)
D. Gratadour, LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris Diderot (France)


Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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