12 September 2012 The GRAVITY spectrometers: system design
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Abstract
Operating on 6 interferometric baselines, i.e. using all 4 UTs, the 2nd generation VLTI instrument GRAVITY will deliver narrow angle astrometry with 10μas accuracy at K-band. We present the system design of the science and fringe tracking spectrometers of GRAVITY: The fringe tracking spectrometer is optimised for highest sensitivity, providing a fixed spectral resolution. The science spectrometer provides 3 different low - medium spectral resolutions. Both spectrometers provide detector focus stages and deployable Wollaston prisms. The two spectrometers also feed the beams of the metrology laser system of GRAVITY backwards into the integrated optics beam-combiner, propagating back to the M2 mirrors of the 4 telescopes.
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S. Fischer, C. Straubmeier, C. Araujo-Hauck, S. Yazici, M. Wiest, I. Wank, F. Eisenhauer, G. Perrin, A. Eckart, K. Perraut, W. Brandner, A. Amorim, and M. Schöller "The GRAVITY spectrometers: system design", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84451W (12 September 2012); doi: 10.1117/12.925289; https://doi.org/10.1117/12.925289
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