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Proceedings Paper

Near-infrared wavefront sensing for the VLT interferometer
Author(s): Stefan Hippler; Wolfgang Brandner; Yann Clénet; Felix Hormuth; Eric Gendron; Thomas Henning; Ralf Klein; Rainer Lenzen; Daniel Meschke; Vianak Naranjo; Udo Neumann; José Ricardo Ramos; Ralf-Rainer Rohloff; Frank Eisenhauer
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Paper Abstract

The very large telescope (VLT) interferometer (VLTI) in its current operating state is equipped with high-order adaptive optics (MACAO) working in the visible spectrum. A low-order near-infrared wavefront sensor (IRIS) is available to measure non-common path tilt aberrations downstream the high-order deformable mirror. For the next generation of VLTI instrumentation, in particular for the designated GRAVITY instrument, we have examined various designs of a four channel high-order near-infrared wavefront sensor. Particular objectives of our study were the specification of the near-infrared detector in combination with a standard wavefront sensing system. In this paper we present the preliminary design of a Shack-Hartmann wavefront sensor operating in the near-infrared wavelength range, which is capable of measuring the wavefronts of four telescopes simultaneously. We further present results of our design study, which aimed at providing a first instrumental concept for GRAVITY.

Paper Details

Date Published: 15 July 2008
PDF: 11 pages
Proc. SPIE 7015, Adaptive Optics Systems, 701555 (15 July 2008); doi: 10.1117/12.789053
Show Author Affiliations
Stefan Hippler, Max-Planck-Institut für Astronomie (Germany)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)
Yann Clénet, Observatoire de Paris à Meudon (France)
Felix Hormuth, Max-Planck-Institut für Astronomie (Germany)
Eric Gendron, Observatoire de Paris à Meudon (France)
Thomas Henning, Max-Planck-Institut für Astronomie (Germany)
Ralf Klein, Max-Planck-Institut für Astronomie (Germany)
Rainer Lenzen, Max-Planck-Institut für Astronomie (Germany)
Daniel Meschke, Max-Planck-Institut für Astronomie (Germany)
Vianak Naranjo, Max-Planck-Institut für Astronomie (Germany)
Udo Neumann, Max-Planck-Institut für Astronomie (Germany)
José Ricardo Ramos, Max-Planck-Institut für Astronomie (Germany)
Ralf-Rainer Rohloff, Max-Planck-Institut für Astronomie (Germany)
Frank Eisenhauer, Max-Planck-Institut für Extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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