Vincent, Lionel[Lab. d'Astrophysique de Grenoble (France) and GIPSA-Lab (France)]
Optical and Infrared Interferometry II
Danchi, W. C.
Rajagopal, J. K.
Proceedings of the SPIE, volume 7734
Astronomical Telescopes and Instrumentation 2010: Optical and Infrared Interferometry II
27/06/2010 - 2/07/2010
[en] In a few years, the second generation instruments of the Very Large Telescope Interferometer (VLTI) will routinely provide observations with 4 to 6 telescopes simultaneously. To reach their ultimate performance, they will need a fringe sensor capable to measure in real time the randomly varying optical paths differences. A collaboration between LAOG (PI institute), IAGL, OCA and GIPSA-Lab has proposed the Planar Optics Phase Sensor concept to ESO for the 2[SUP]nd[/SUP] Generation Fringe Tracker. This concept is based on the integrated optics technologies, enabling the conception of extremely compact interferometric instruments naturally providing single-mode spatial filtering. It allows operations with 4 and 6 telescopes by measuring the fringes position thanks to a spectrally dispersed ABCD method. We present here the main analysis which led to the current concept as well as the expected on-sky performance and the proposed design.