Opto-mechanical design of the spectrometers of GRAVITY: the 6-Baseline K-Band Interferometer for the VLTI

Christian Straubmeier; Frank Eisenhauer; Guy Perrin; Wolfgang Brandner; Andreas Eckart

doi:10.1117/12.787549

28 July 2008 Opto-mechanical design of the spectrometers of GRAVITY: the 6-Baseline K-Band Interferometer for the VLTI

Christian Straubmeier, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Andreas Eckart

Proceedings Volume 7013, Optical and Infrared Interferometry; 701331 (2008) https://doi.org/10.1117/12.787549
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

GRAVITY is a 2nd generation VLTI instrument that operates in the K-band and uses up to 4 telescopes simultaneously. GRAVITY will provide interferometric astrometry of two objects in a 2 arcsecond field of view at an astrometric precision of 10 μas. Using all four UTs and six interferometric baselines, it will allow for phase-referenced imaging at mas resolution in combination with spectroscopic and polarimetric observing capabilities. The large field of view of the VLTI delay lines is worldwide unique on a 140 m baseline, and no other VLTI instrument is taking advantage of that outstanding capability so far. In this paper we present the optical and mechanical design of the two spectrometers of the instrument. The presented design resulted from the successful Phase A study of the system and provides low-resolution spectroscopy using grisms and Wollaston prisms for polarimetry.

Citation Download Citation

Christian Straubmeier, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, and Andreas Eckart "Opto-mechanical design of the spectrometers of GRAVITY: the 6-Baseline K-Band Interferometer for the VLTI", Proc. SPIE 7013, Optical and Infrared Interferometry, 701331 (28 July 2008); https://doi.org/10.1117/12.787549

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