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21 July 2010 The GRAVITY integrated optics beam combination
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Gravity is a 2nd generation interferometric instrument for VLTI. It will combine 4 telescopes in dual feed in the K band to study general relativity effects around the Galactic Center black hole. The concept of Gravity is based on two equivalent beam combiner instruments: the scientific one fed by the science target (Sgr A*) and the fringe tracker fed by a bright reference star (See Gillessen et al.1). Both beam combination instruments are based on silica on silicon integrated optics (IO) component glued to fluoride glass fiber array. The beam combiners are implemented in a cryogenic vessel cooled at 200°K and back-illuminated by a high power laser used for metrology (Bartko et al.2). This paper is dedicated to the description of the development of the integrated beam combiner assembly.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Jocou, K. Perraut, A. Nolot, J. P. Berger, T. Moulin, P. Labeye, S. Lacour, G. Perrin, J. B. Lebouquin, H. Bartko, M. Thiel, and F. Eisenhauer "The GRAVITY integrated optics beam combination", Proc. SPIE 7734, Optical and Infrared Interferometry II, 773430 (21 July 2010);

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