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Proceedings Paper

A compact design of a WFS for a natural guide star-based ELT adaptive optics system
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Paper Abstract

We describe the opto-mechanical implementation of a group of wavefront sensors able to drive an MCAO system in order to cover a Field of View of the order of 1-2 arc-minutes, but getting advantages from the starlight coming from a Field of View as large as 10 arc-minutes in diameter. This involves a number of arms with a miniaturized, very small Field of View, single reference Adaptive Optics systems. A pyramid wavefront sensor working in close loop is fed through a small Deformable Mirror that is continuously monitored by an extremely high dynamic range wavefront sensor, whose signal has similar modality than the Pyramid one, namely YAW. In this way, a very compact wavefront sensor with a dynamic range limited by the stroke of the Deformable Mirror is achieved. Such a sensor is characterized by a limiting magnitude performances typical of a closed loop coherent wavefront sensor. This concept, in addition with an architecture of a Wavefront Computer that allows the implementation of a number of virtual Deformable Mirrors, allows for the development of a NGS based concept described elsewhere. Emphasis is given in this talk to the practical implementation and to the opto-mechanical details, including an overview of the required components, especially the detectors and the deformable mirrors and we show that the goal is attainable with today existing components.

Paper Details

Date Published: 28 July 2010
PDF: 7 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77362M (28 July 2010); doi: 10.1117/12.857304
Show Author Affiliations
Jacopo Farinato, INAF-Osservatorio Astronomico di Padova (Italy)
Valentina Viotto, INAF-Osservatorio Astronomico di Padova (Italy)
Univ. degli Studi di Padova (Italy)
Roberto Ragazzoni, INAF-Osservatorio Astronomico di Padova (Italy)
Carmelo Arcidiacono, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Andrea Baruffolo, INAF-Osservatorio Astronomico di Padova (Italy)
Marco Dima, INAF-Osservatorio Astronomico di Padova (Italy)
Giorgia Gentile, INAF-Osservatorio Astronomico di Padova (Italy)
Demetrio Magrin, INAF-Osservatorio Astronomico di Padova (Italy)
Pierfrancesco Rossettini, Tomelleri s.r.l. (Italy)

Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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