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Proceedings Paper

The fiber coupler and beam stabilization system of the GRAVITY interferometer
Author(s): O. Pfuhl; M. Haug; F. Eisenhauer; S. Kellner; F. Haussmann; G. Perrin; S. Gillessen; C. Straubmeier; T. Ott; K. Rousselet-Perraut; A. Amorim; Magdalena Lippa; A. Janssen; W. Brandner; Yitping Kok; N. Blind; L. Burtscher; E. Sturm; E. Wieprecht; M. Schoeller; J. Weber; O. Hans; S. Huber
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Paper Abstract

We present the installed and fully operational beam stabilization and fiber injection subsystem feeding the 2nd generation VLTI instrument GRAVITY. The interferometer GRAVITY requires an unprecedented stability of the VLTI optical train to achieve micro-arcsecond astrometry. For this purpose, GRAVITY contains four fiber coupler units, one per telescope. Each unit is equipped with actuators to stabilize the telescope beam in terms of tilt and lateral pupil displacement, to rotate the field, to adjust the polarization and to compensate atmospheric piston. A special roof-prism offers the possibility of on-axis as well as off-axis fringe tracking without changing the optical train. We describe the assembly, integration and alignment and the resulting optical quality and performance of the individual units. Finally, we present the closed-loop performance of the tip-tilt and pupil tracking achieved with the final systems in the lab.

Paper Details

Date Published: 24 July 2014
PDF: 14 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914623 (24 July 2014); doi: 10.1117/12.2055080
Show Author Affiliations
O. Pfuhl, Max-Planck-Institut für extraterrestrische Physik (Germany)
M. Haug, Max-Planck-Institut für extraterrestrische Physik (Germany)
F. Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
S. Kellner, Max-Planck-Institut für extraterrestrische Physik (Germany)
F. Haussmann, Max-Planck-Institut für extraterrestrische Physik (Germany)
G. Perrin, Lab. d'études spatiales et d'instrumentation en astrophysique, CNRS, Observatoire de Paris à Meudon (France)
S. Gillessen, Max-Planck-Institut für extraterrestrische Physik (Germany)
C. Straubmeier, Univ. zu Köln (Germany)
T. Ott, Max-Planck-Institut für extraterrestrische Physik (Germany)
K. Rousselet-Perraut, Institut de Planétologie et d’Astrophysique de Grenoble (France)
A. Amorim, Fundacão da Faculdade de Ciências da Univ. de Lisboa (Portugal)
Magdalena Lippa, Max-Planck-Institut für extraterrestrische Physik (Germany)
A. Janssen, Max-Planck-Institut für extraterrestrische Physik (Germany)
W. Brandner, Max-Planck-Institut für Astronomie (Germany)
Yitping Kok, Max-Planck-Institut für extraterrestrische Physik (Germany)
N. Blind, Max-Planck-Institut für extraterrestrische Physik (Germany)
L. Burtscher, Max-Planck-Institut für extraterrestrische Physik (Germany)
E. Sturm, Max-Planck-Institut für extraterrestrische Physik (Germany)
E. Wieprecht, Max-Planck-Institut für extraterrestrische Physik (Germany)
M. Schoeller, European Southern Observatory (Germany)
J. Weber, Max-Planck-Institut für extraterrestrische Physik (Germany)
O. Hans, Max-Planck-Institut für extraterrestrische Physik (Germany)
S. Huber, Max-Planck-Institut für extraterrestrische Physik (Germany)


Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

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