12 September 2012 The GRAVITY spectrometers: metrology laser blocking system
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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 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.
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Constanza Araujo-Hauck, Constanza Araujo-Hauck, Sebastian Fischer, Sebastian Fischer, Stefan Gillessen, Stefan Gillessen, Christian Straubmeier, Christian Straubmeier, Michael Wiest, Michael Wiest, Senol Yazici, Senol Yazici, Imke Wank, Imke Wank, Frank Eisenhauer, Frank Eisenhauer, Guy S. Perrin, Guy S. Perrin, Wolfgang Brandner, Wolfgang Brandner, Karine Perraut, Karine Perraut, António Amorim, António Amorim, Andreas Eckart, Andreas Eckart, } "The GRAVITY spectrometers: metrology laser blocking system", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452S (12 September 2012); doi: 10.1117/12.925151; https://doi.org/10.1117/12.925151
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