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

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.

Citation Download Citation

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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