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Proceedings Paper

Combining spatially filtered Shack-Hartmann wavefront sensing and coronography in closed loop AO simulations
Author(s): Visa Korkiakoski; Miska Le Louarn; Christophe Verinaud
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Paper Abstract

We made complete end-to-end adaptive optics (AO) simulations to model the closed loop performance with and without pupil apodization, a spatially filtered wavefront sensor (SF-WFS) and a coronagraph. We investigated the SF performance (the Strehl ratio and the stellar intensity reduction in the halo) with several configurations in different seeing conditions. We also ran several extensive coronagraph simulations modeling a 32m telescope to obtain an investigate the exoplanet detection possibilities. The results show that a four-quadrant phase mask coronagraph can damp the intensity about 105 times from the original intensity at seeing conditions having r0=20 cm at 0.5μm. When the SF is used, an additional intensity reduction of about 50-70% can be obtained.

Paper Details

Date Published: 25 October 2004
PDF: 10 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551084
Show Author Affiliations
Visa Korkiakoski, European Southern Observatory (Germany)
Miska Le Louarn, European Southern Observatory (Germany)
Christophe Verinaud, European Southern Observatory (Germany)

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

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