Visible MCAO channel for NIRVANA at the LBT

Roberto Ragazzoni; Tom M. Herbst; Wolfgang Gaessler; David Andersen; Carmelo Arcidiacono; Andrea Baruffolo; Harald Baumeister; Peter Bizenberger; Emiliano Diolaiti; Simone Esposito; Jacopo Farinato; Hans Walter Rix; Ralf-Rainer Rohloff; Armando Riccardi; Piero Salinari; Roberto Soci; Elise Vernet-Viard; Wenli Xu

doi:10.1117/12.459033

7 February 2003 A visible MCAO channel for NIRVANA at the LBT

Roberto Ragazzoni, Tom M. Herbst, Wolfgang Gaessler, David Andersen, Carmelo Arcidiacono, Andrea Baruffolo, Harald Baumeister, Peter Bizenberger, Emiliano Diolaiti, Simone Esposito, Jacopo Farinato, Hans Walter Rix, Ralf-Rainer Rohloff, Armando Riccardi, Piero Salinari, Roberto Soci, Elise Vernet-Viard, Wenli Xu

Author Affiliations +

Proceedings Volume 4839, Adaptive Optical System Technologies II; (2003) https://doi.org/10.1117/12.459033
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

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Roberto Ragazzoni, Tom M. Herbst, Wolfgang Gaessler, David Andersen, Carmelo Arcidiacono, Andrea Baruffolo, Harald Baumeister, Peter Bizenberger, Emiliano Diolaiti, Simone Esposito, Jacopo Farinato, Hans Walter Rix, Ralf-Rainer Rohloff, Armando Riccardi, Piero Salinari, Roberto Soci, Elise Vernet-Viard, and Wenli Xu "A visible MCAO channel for NIRVANA at the LBT", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); https://doi.org/10.1117/12.459033

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