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Correction of differential chromatic dispersion in GRAVITY
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Paper Abstract

The GRAVITY instrument installed at VLTI uses differential fibered delay lines to spatially filter the incoming wavefronts and accurately control the optical path difference between the Fringe Tracker (FT) and Scientific Detector (SC) parts of the instrument. On top of the differential dispersion occurring in the air, the chromatic dispersion introduced by these fibers impacts the real time performances of the fringe tracker by generating a second-order chromatic phase shift. Moreover, differential dispersion also affects GRAVITY dual-feed measurements that require a length adjustment of both FT and SC fibers. In this contribution, we show how chromatic dispersion can be corrected both in the fringe tracker real-time control as well as in the astrometric data reduction.

Paper Details

Date Published: 9 July 2018
PDF: 6 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107011P (9 July 2018); doi: 10.1117/12.2312154
Show Author Affiliations
Xavier Haubois, European Southern Observatory (Chile)
Sylvestre Lacour, LESIA, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
Guy S. Perrin, LESIA, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
Roderick Dembet, European Southern Observatory (Germany)
Jean-Baptiste Le Bouquin, Univ. Grenoble Alps, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Vincent Lapeyrère, LESIA, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
Burkhard Wolff, European Southern Observatory (Germany)
Frank Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Karine Rousselet-Perraut, Univ. Grenoble Alps, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Christian Straubmeier, Univ. zu Köln (Germany)
Antonio Amorim, Univ. de Lisboa (Portugal)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)


Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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