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.
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Constanza Araujo-Hauck, Sebastian Fischer, Hendrik Bartko, Stefan Gillessen, Christian Straubmeier, Michael Wiest, Senol Yazici, Frank Eisenhauer, Guy S. Perrin, Wolfgang Brandner, Karine Perraut, Antonio Amorim, 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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