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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Constanza Araujo-Hauck, Sebastian Fischer, Stefan Gillessen, Christian Straubmeier, Michael Wiest, Senol Yazici, Imke Wank, Frank Eisenhauer, Guy S. Perrin, Wolfgang Brandner, Karine Perraut, António Amorim, and Andreas Eckart "The GRAVITY spectrometers: metrology laser blocking system", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452S (12 September 2012); https://doi.org/10.1117/12.925151
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