21 July 2010 GRAVITY spectrometer: metrology laser blocking strategy at OD=12
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Constanza Araujo-Hauck, Constanza Araujo-Hauck, Sebastian Fischer, Sebastian Fischer, Hendrik Bartko, Hendrik Bartko, Stefan Gillessen, Stefan Gillessen, Christian Straubmeier, Christian Straubmeier, Michael Wiest, Michael Wiest, Senol Yazici, Senol Yazici, Frank Eisenhauer, Frank Eisenhauer, Guy S. Perrin, Guy S. Perrin, Wolfgang Brandner, Wolfgang Brandner, Karine Perraut, Karine Perraut, Antonio Amorim, Antonio Amorim, Andreas Eckart, Andreas Eckart, } "GRAVITY spectrometer: metrology laser blocking strategy at OD=12", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342Z (21 July 2010); doi: 10.1117/12.856021; https://doi.org/10.1117/12.856021
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