A NGSs based WFS for the E-ELT and the VLT

J. Farinato; R. Ragazzoni; D. Magrin; V. Viotto; M. Bergomi; A. Brunelli; M. Dima; L. Marafatto

doi:10.1117/12.926792

13 September 2012 A NGSs based WFS for the E-ELT and the VLT

J. Farinato, R. Ragazzoni, D. Magrin, V. Viotto, M. Bergomi, A. Brunelli, M. Dima, L. Marafatto

Author Affiliations +

Proceedings Volume 8447, Adaptive Optics Systems III; 84474X (2012) https://doi.org/10.1117/12.926792
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

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J. Farinato, R. Ragazzoni, D. Magrin, V. Viotto, M. Bergomi, A. Brunelli, M. Dima, and L. Marafatto "A NGSs based WFS for the E-ELT and the VLT", Proc. SPIE 8447, Adaptive Optics Systems III, 84474X (13 September 2012); https://doi.org/10.1117/12.926792

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