8 August 2016 Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model
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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.
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R. Holzlöhner, R. Holzlöhner, S. Taubenberger, S. Taubenberger, A. P. Rakich, A. P. Rakich, L. Noethe, L. Noethe, P. Schipani, P. Schipani, K. Kuijken, K. Kuijken, } "Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99066E (8 August 2016); doi: 10.1117/12.2234398; https://doi.org/10.1117/12.2234398
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