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Proceedings Paper

GRAVITY spectrometer: metrology laser blocking strategy at OD=12
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Paper Abstract

A two stage blocking system is implemented in the GRAVITY science and the fringe tracking spectrometer optical design. The blocking system consists of a dichroic mirror and a long wave band-pass filter with the top level requirements of high transmission of the science light in the K-Band (1.95 - 2.5 μm) region and high blocking power optical density (OD) ≥ 8 for the metrology laser wavelength at 1.908 μm. The laser metrology blocking filters have been identified as one critical optical component in the GRAVITY science and fringe tracker spectrometer design. During the Phase-B study of GRAVITY we procured 3 blocking filter test samples for demonstration and qualification tests. We present the measurements results of an effective blocking of the metrology laser wavelength with a long wave band-pass filter at OD=12.

Paper Details

Date Published: 21 July 2010
PDF: 9 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342Z (21 July 2010); doi: 10.1117/12.856021
Show Author Affiliations
Constanza Araujo-Hauck, Univ. zu Köln (Germany)
Sebastian Fischer, Univ. zu Köln (Germany)
Hendrik Bartko, Max-Planck-Institut für extraterrestrische Physik (Germany)
Stefan Gillessen, Max-Planck-Institut für extraterrestrische Physik (Germany)
Christian Straubmeier, Univ. zu Köln (Germany)
Michael Wiest, Univ. zu Köln (Germany)
Senol Yazici, Univ. zu Köln (Germany)
Frank Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Guy S. Perrin, Lab. d'Etudes Spatiales et d'Instumentation en Astrophysique (France)
Institut National des Sciences de l'Univers (France)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)
Karine Perraut, Lab. d'Astrophysique Observatoire de Grenoble (France)
Antonio Amorim, Facultade de Ciencias da Univ. de Lisboa (Portugal)
Andreas Eckart, Univ. zu Köln (Germany)
Max Planck Institute für Radio Astronomie (Germany)

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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