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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 559053.0, MPI für Astronomie / Publikationen_mpia
GRAVITY spectrometer: metrology laser blocking strategy at OD=12
Authors:Araujo-Hauck, Constanza; Fischer, Sebastian; Bartko, Hendrik; Gillessen, Stefan; Straubmeier, Christian; Wiest, Michael; Yazici, Senol; Eisenhauer, Frank; Perrin, Guy S.; Brandner, Wolfgang; Perraut, Karine; Amorim, Antonio; Eckart, Andreas
Publisher:SPIE
Place of Publication:Bellingham, Wash.
Date of Publication (YYYY-MM-DD):2010
Title of Proceedings:Optical and Infrared Interferometry II
Start Page:95
Title of Series:SPIE
Volume (in Series):7734
Name of Conference/Meeting:Optical and Infrared Interferometry II
Review Status:not specified
Audience:Experts Only
Abstract / Description: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.
Comment of the Author/Creator:Date: 2010, July 1, 2010
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010SPIE.7734E..95A [ID No:1]
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