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Proceedings Paper

A NGSs based WFS for the E-ELT and the VLT
Author(s): J. Farinato; R. Ragazzoni; D. Magrin; V. Viotto; M. Bergomi; A. Brunelli; M. Dima; L. Marafatto
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Paper Abstract

In the framework of the European ELT design, partially open-loop MCAO systems, coupled with virtual DMs, have been proposed to achieve AO correction using solely NGSs, to be selected in a FoV as wide as allowed by the Telescope optical design. The conceptual design of a very compact wavefront sensor, exploiting the just mentioned concept and characterized by a dynamic range limited by the stroke of the Deformable Mirror and by a limiting magnitude performance typical of a closed loop coherent wavefront sensor, have been presented in the past. This concept was based on the usage of a very linear wavefront sensor, like a YAW sensor, but a DM having the actual shape known “a-priori” could simplify a lot the design of such a compact WFS. We investigate here the realm of possible opto-mechanical realization of a probe, capable to co-exist with the currently foreseen E-ELT LGS probes and giving the possibility to exploit the open loop wavefront sensing operation with the aim of reaching a preliminary design of such a system. Furthermore, we devise a conceptual opto-mechanical design of a precursor of such a system, which could exploit at the VLT Global MCAO correction on the lower part of the atmosphere.

Paper Details

Date Published: 13 September 2012
PDF: 9 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84474X (13 September 2012); doi: 10.1117/12.926792
Show Author Affiliations
J. Farinato, INAF - Osservatorio Astronomico di Padova (Italy)
R. Ragazzoni, INAF - Osservatorio Astronomico di Padova (Italy)
D. Magrin, INAF - Osservatorio Astronomico di Padova (Italy)
V. Viotto, INAF - Osservatorio Astronomico di Padova (Italy)
M. Bergomi, INAF - Osservatorio Astronomico di Padova (Italy)
Univ. degli Studi di Padova (Italy)
A. Brunelli, INAF - Osservatorio Astronomico di Padova (Italy)
M. Dima, INAF - Osservatorio Astronomico di Padova (Italy)
L. Marafatto, Univ. degli Studi di Padova (Italy)

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

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