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Proceedings Paper

The GRAVITY integrated optics beam combination
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Paper Abstract

Gravity is a 2nd generation interferometric instrument for VLTI. It will combine 4 telescopes in dual feed in the K band to study general relativity effects around the Galactic Center black hole. The concept of Gravity is based on two equivalent beam combiner instruments: the scientific one fed by the science target (Sgr A*) and the fringe tracker fed by a bright reference star (See Gillessen et al.1). Both beam combination instruments are based on silica on silicon integrated optics (IO) component glued to fluoride glass fiber array. The beam combiners are implemented in a cryogenic vessel cooled at 200°K and back-illuminated by a high power laser used for metrology (Bartko et al.2). This paper is dedicated to the description of the development of the integrated beam combiner assembly.

Paper Details

Date Published: 21 July 2010
PDF: 12 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 773430 (21 July 2010); doi: 10.1117/12.856375
Show Author Affiliations
L. Jocou, LAOG, CNRS (France)
K. Perraut, LAOG, CNRS (France)
A. Nolot, LAOG, CNRS (France)
J. P. Berger, European Southern Observatory (Germany)
T. Moulin, LAOG, CNRS (United States)
P. Labeye, CEA/LETI (France)
S. Lacour, Max-Planck-Institute for extraterrestrial physics (Germany)
G. Perrin, Max-Planck-Institute for extraterrestrial physics (Germany)
J. B. Lebouquin, LAOG, CNRS (France)
H. Bartko, LESIA, Observatoire de Paris à Meudon (France)
M. Thiel, LESIA, Observatoire de Paris à Meudon (France)
F. Eisenhauer, LESIA, Observatoire de Paris à Meudon (France)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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