The GRAVITY integrated optics beam combination
2010
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.
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