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Proceedings Paper

Implementation of the pyramid wavefront sensor as a direct phase detector for large amplitude aberrations
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Paper Abstract

We investigate the non-modulating pyramid wave-front sensor's (P-WFS) implementation in the context of Lick Observatory's Villages visible light AO system on the Nickel 1-meter telescope. A complete adaptive optics correction, using a non-modulated P-WFS in slope sensing mode as a boot-strap to a regime in which the P-WFS can act as a direct phase sensor is explored. An iterative approach to reconstructing the wave-front phase, given the pyramid wave-front sensor's non-linear signal, is developed. Using Monte Carlo simulations, the iterative reconstruction method's photon noise propagation behavior is compared to both the pyramid sensor used in slope-sensing mode, and the traditional Shack Hartmann sensor's theoretical performance limits. We determine that bootstrapping using the P-WFS as a slope sensor does not offer enough correction to bring the phase residuals into a regime in which the iterative algorithm can provide much improvement in phase measurement. It is found that both the iterative phase reconstructor and the slope reconstruction methods offer an advantage in noise propagation over Shack Hartmann sensors.

Paper Details

Date Published: 15 July 2008
PDF: 10 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70155H (15 July 2008); doi: 10.1117/12.790181
Show Author Affiliations
Renate Kupke, Laboratory for Adaptive Optics, UCSC (United States)
Don Gavel, Laboratory for Adaptive Optics, UCSC (United States)
Jess Johnson, Laboratory for Adaptive Optics, UCSC (United States)
Marc Reinig, Laboratory for Adaptive Optics, UCSC (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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