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Proceedings Paper

The acquisition, guiding, and wavefront sensing units for the Large Binocular Telescope
Author(s): Jesper Storm; Walter Seifert; Svend-Marian Bauer; Frank Dionies; Thomas Fechner; Felix Kramer; Gunter Mostl; Emil Popow; Simone Esposito; John M. Hill; Piero Salinari
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Paper Abstract

We present the final opto-mechanical design of the Large Binocular Telescope (LBT) Acquisition, Guiding and Wavefront Sensing Units (AGW-units) together with the laboratory test performance of the units. The units will be installed at the LBT shortly after this conference, at several of the different Gregorian focal positions available. Each AGW-unit consists of a probe with a camera and a wavefront sensor located in front of the science instrument. The probe can move in two axes allowing it to patrol a field off-axis to the science field. A dichroic beam-splitter on the probe transmits the blue light to the acquisition and guide camera and the red light is reflected into a Shack-Hartmann wavefront sensor. The guide camera is equipped with a 2.5x focal reducer giving a field of view of 28"x28" on a 512x1024 frame-transfer CCD. The 12x12 sub-pupil wavefront sensor uses a micro lenslet array made using an ion-exchange technique on a flat substrate with diffraction limited performance.

Paper Details

Date Published: 28 September 2004
PDF: 8 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.551126
Show Author Affiliations
Jesper Storm, Astrophysikalisches Institut Potsdam (Germany)
Walter Seifert, Landessternwarte Heidelberg-Konigstuhl (Germany)
Svend-Marian Bauer, Astrophysikalisches Institut Potsdam (Germany)
Frank Dionies, Astrophysikalisches Institut Potsdam (Germany)
Thomas Fechner, Astrophysikalisches Institut Potsdam (Germany)
Felix Kramer, Astrophysikalisches Institut Potsdam (Germany)
Gunter Mostl, Astrophysikalisches Institut Potsdam (Germany)
Emil Popow, Astrophysikalisches Institut Potsdam (Germany)
Simone Esposito, INAF, Osservatorio Astrofisico di Arcetri (Italy)
John M. Hill, Large Binocular Telescope Observatory/Univ. of Arizona (United States)
Piero Salinari, INAF, Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann Jr., Editor(s)

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