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Proceedings Paper

Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model
Author(s): R. Holzlöhner; S. Taubenberger; A. P. Rakich; L. Noethe; P. Schipani; K. Kuijken
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Paper Abstract

We study a novel focal plane wavefront sensing and active optics control scheme at the VST on Cerro Paranal, an f/5.5 survey telescope with a 1x1 degree field of view and a 2.6m primary mirror. This scheme analyzes the elongation pattern of stellar PSFs across the full science image (256 Mpixels) and compares their second moments with an analytical model based on 5th-order geometrical optics. We consider 11 scalar degrees of freedom in mirror misalignments and deformations (M2 piston, tip/tilt and lateral displacement, detector tip/tilt, plus M1 figure astigmatism and trefoil). Using a numerical optimization method, we extract up to 4000 stars and complete the fitting process in under one minute. We demonstrate successful closed-loop active optics control based on maximum likelihood filtering.

Paper Details

Date Published: 8 August 2016
PDF: 11 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99066E (8 August 2016); doi: 10.1117/12.2234398
Show Author Affiliations
R. Holzlöhner, European Southern Observatory (Germany)
S. Taubenberger, European Southern Observatory (Germany)
A. P. Rakich, GMTO Corp. (United States)
European Southern Observatory (Germany)
L. Noethe, European Southern Observatory (Germany)
P. Schipani, INAF-Osservatorio Astronomico di Capodimonte (Italy)
K. Kuijken, Leiden Observatory (Netherlands)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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