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Paper Abstract

In order to achieve moderate Field of View (2 arcmin in diameter) and nearly diffraction limited capabilities, at the reddest portion of the visible spectrum in the interferometric mode of LBT, two sophisticated MCAO channels are required. These are being designed to perform a detailed correction of the atmospheric turbulence through three deformable mirrors per telescope arm: the secondary adaptive mirror and two commercial piezostack mirrors, leading to an overall number of degree of freedom totaling ~ 3000. A combination of numerical and optical coaddition of light collected from natural reference stars located inside the scientific Field of View and in an annular region, partially vignetted, and extending up to ≈ 6 arcmin in diameter, allows for such a performance with individual loops characterized by a much smaller number of degree of freedom, making the real-time computation, although still challenging, to more reasonable levels. We implement in the MCAO channel the dual Field of View layer-oriented approach using natural guide stars, only allowing for limited, but significant, sky coverage.

Paper Details

Date Published: 7 February 2003
PDF: 8 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459033
Show Author Affiliations
Roberto Ragazzoni, Osservatorio Astrofisico di Arcetri and Max-Planck-Institut für Astronomie (Italy)
Tom M. Herbst, Max-Planck-Institut für Astronomie (Germany)
Wolfgang Gaessler, Max-Planck-Institut für Astronomie (Germany)
David Andersen, Max-Planck-Institut für Astronomie (Germany)
Carmelo Arcidiacono, Univ. degli Studi di Firenze (Italy)
Andrea Baruffolo, Osservatorio Astronomico di Padova (Italy)
Harald Baumeister, Max-Planck-Institut für Astronomie (Germany)
Peter Bizenberger, Max-Planck-Institut für Astronomie (Germany)
Emiliano Diolaiti, Univ. degli Studi di Padova (Italy)
Simone Esposito, Osservatorio Astrofisico di Arcetri (Italy)
Jacopo Farinato, Osservatorio Astrofisico di Arcetri (Italy)
Hans Walter Rix, Max-Planck-Institut für Astronomie (Germany)
Ralf-Rainer Rohloff, Max-Planck-Institut für Astronomie (Germany)
Armando Riccardi, Osservatorio Astrofisico di Arcetri (Italy)
Piero Salinari, Osservatorio Astrofisico di Arcetri (Italy)
Roberto Soci, Max-Planck-Institut für Astronomie (Germany)
Elise Vernet-Viard, Osservatorio Astrofisico di Arcetri (Italy)
Wenli Xu, Max-Planck-Institut für Astronomie (Germany)


Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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