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Proceedings Paper

The GRAVITY spectrometers: metrology laser blocking system
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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 beam splitter and two long wave band-pass filters with the top level requirements of high transmission of the science light in the K-Band (1.95 - 2.45 μm) region and high blocking power optical density (OD) ≥ 8 for each filter at the metrology laser wavelength of 1.908 μm. The laser metrology blocking filters were identified as one critical optical component in the GRAVITY science and fringe tracker spectrometer design. During the Phase-C study of GRAVITY all the filters were procured and individually tested in terms of spectral response at K-band, transmission, blocking (OD) and reflection at the metrology laser wavelength. We present the measurements results of the full metrology blocking system in its final configuration as to be implemented in the GRAVITY spectrometers.

Paper Details

Date Published: 12 September 2012
PDF: 10 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452S (12 September 2012); doi: 10.1117/12.925151
Show Author Affiliations
Constanza Araujo-Hauck, Univ. zu Köln (Germany)
Sebastian Fischer, Univ. zu Köln (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)
Imke Wank, Univ. zu Köln (Germany)
Frank Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Guy S. Perrin, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique (France)
Institut National des Sciences de l'Univers, Paris (France)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)
Karine Perraut, Lab. d'Astrophysique, Observatoire de Grenoble (France)
António Amorim, Univ. de Lisboa (Portugal)
Andreas Eckart, Univ. zu Köln (Germany)
Max-Planck-Institut für Radioastronomie (Germany)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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