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Proceedings Article

A visible MCAO channel for NIRVANA at the LBT

[+] Author Affiliations
Roberto Ragazzoni

Osservatorio Astrofisico di Arcetri and Max-Planck-Institut f?r Astronomie (Italy)

Tom M. Herbst, Wolfgang Gaessler, David Andersen, Harald Baumeister, Peter Bizenberger, Hans W. Rix, Ralf-Rainer Rohloff, Roberto Soci, Wenli Xu

Max-Planck-Institut f?r Astronomie (Germany)

Carmelo Arcidiacono

Univ. degli Studi di Firenze (Italy)

Andrea Baruffolo

Osservatorio Astronomico di Padova (Italy)

Emiliano Diolaiti

Univ. degli Studi di Padova (Italy)

Simone Esposito, Jacopo Farinato, Armando Riccardi, Piero Salinari, Elise Vernet-Viard

Osservatorio Astrofisico di Arcetri (Italy)

Proc. SPIE 4839, Adaptive Optical System Technologies II, 536 (February 1, 2003); doi:10.1117/12.459033
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From Conference Volume 4839

  • Adaptive Optical System Technologies II
  • Peter L. Wizinowich; Domenico Bonaccini
  • Waikoloa, Hawai'i, United States | August 22, 2002

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.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Roberto Ragazzoni ; Tom M. Herbst ; Wolfgang Gaessler ; David Andersen ; Carmelo Arcidiacono, et al.
"A visible MCAO channel for NIRVANA at the LBT", Proc. SPIE 4839, Adaptive Optical System Technologies II, 536 (February 1, 2003); doi:10.1117/12.459033; http://dx.doi.org/10.1117/12.459033


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