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Layer-Oriented on paper, laboratory, and soon on the sky
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Paper Abstract

Layer Oriented represented in the last few years a new and promising aproach to solve the problems related to the limited field of view achieved by classical Adaptive Optics systems. It is basically a different approach to multi conjugate adaptive optics, in which pupil plane wavefront sensors (like the pyramid one) are conjugated to the same altitudes as the deformable mirrors. Each wavefront sensor is independently driving its conjugated deformable mirror thus simplifying strongly the complexity of the wavefront computers used to reconstruct the deformations and drive the mirror themselves, fact that can become very important in the case of extremely large telescopes where the complexity is a serious issue. The fact of using pupil plane wavefront sensors allow for optical co-addition of the light at the level of the detector thus increasing the SNR of the system and permitting the usage of faint stars, improving the efficiency of the wavefront sensor. Furthermore if coupled to the Pyramid wavefront sensor (because of its high sensitivity), this technique is actually peforming a very efficient usage of the light leading to the expectation that, even by using only natural guide stars, a good sky coverage can be achieved, above all in the case of giant telescopes. These are the main reasons for which in the last two years several projects decided to make MCAO systems based on the Layer Oriented technique. This is the case of MAD (an MCAO demonstrator that ESO is building with one wavefront sensing channel based on the Layer Oriented concept) and NIRVANA (an instrument for LBT). Few months ago we built and successfully tested a first prototype of a layer oriented wavefront sensor and experiments and demonstrations on the sky are foreseen even before the effective first light of the above mentioned instruments. The current situation of all these projects is presented, including the extensive laboratory testing and the on-going experiments on the sky.

Paper Details

Date Published: 7 July 2004
PDF: 10 pages
Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); doi: 10.1117/12.566345
Show Author Affiliations
Jacopo Farinato, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Max-Planck-Institut fur Astronomie (Germany)
Roberto Ragazzoni, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Max-Planck-Institut fur Astronomie (Germany)
Carmelo Arcidiacono, Univ. degli Studi di Firenze (Italy)
Bagnara Paolo, INAF-Osservatorio Astronomico di Padova (Italy)
Andrea Baruffolo, INAF-Osservatorio Astronomico di Padova (Italy)
Harald Baumeister, Max-Planck-Institut fur Astronomie (Germany)
Raffaella Bisson, NIDEK Technologies Srl (Italy)
Hermann Bohnhardt, Max-Planck-Institut fur Astronomie (Germany)
Angela Brindisi, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Joar Brynnel, European Southern Observatory (Germany)
Massimo Cecconi, Ctr. Galileo Galilei (Spain)
Julien Coyne, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Bernhard Delabre, European Southern Observatory (Germany)
Emiliano Diolaiti, INAF-Osservatorio Astronomico di Arcetri (Italy)
Univ. degli Studi di Padova (Italy)
Rob Donaldson, European Southern Observatory (Germany)
Enrico Fedrigo, European Southern Observatory (Germany)
Francis Franza, European Southern Observatory (Germany)
Wolfgang Gassler, Max-Planck-Institut fur Astronomie (Germany)
Adriano Ghedina, Ctr. Galileo Galilei (Spain)
Thomas M. Herbst, Max-Planck-Institut fur Astronomie (Germany)
Norbert N. Hubin, European Southern Observatory (Germany)
Stephan Kellner, Max-Planck-Institut fur Astronomie (Germany)
Johann Kolb, European Southern Observatory (Germany)
Jean-Louis Lizon, European Southern Observatory (Germany)
Matteo Lombini, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Univ. degli Studi di Bologna (Italy)
Enrico Marchetti, European Southern Observatory (Germany)
Gianluigi Meneghini, NIDEK Technologies Srl (Italy)
Lars Mohr, Max-Planck-Institut fur Astronomie (Germany)
Roland Reiss, European Southern Observatory (Germany)
Ralf-Rainer Rohloff, Max-Planck-Institut fur Astronomie (Germany)
Roberto Soci, Max-Planck-Institut fur Astronomie (Germany)
Elise Vernet, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Robert Weiss, Max-Planck-Institut fur Astronomie (Germany)
Marco Xompero, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Univ. degli Studi di Padova (Italy)
Wenli Xu, Max-Planck-Institut fur Astronomie (Germany)

Published in SPIE Proceedings Vol. 5382:
Second Backaskog Workshop on Extremely Large Telescopes
Arne L. Ardeberg; Torben Andersen, Editor(s)

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