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28 July 2008 Near-IR spectrograph of VSI (VLTI Spectro Imager): dispersing the light from an integrated optics beam-combiner
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Abstract
We present the optical and cryo-mechanical solutions for the Spectrograph of VSI (VLTI Spectro-Imager), the second generation near-infrared (J, H and K bands) interferometric instrument for the VLTI. The peculiarity of this spectrograph is represented by the Integrated Optics (IO) beam-combiner, a small and delicate component which is located inside the cryostat and makes VSI capable to coherently combine 4, 6 or even 8 telescopes. The optics have been specifically designed to match the IO combiner output with the IR detector still preserving the needed spatial and spectral sampling, as well as the required fringe spacing. A compact device that allows us to interchange spectral resolutions (from R=200 to R=12000), is also presented.
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Dario Lorenzetti, Gianluca Li Causi, Roberto Speziali, Fabrizio Vitali, Davide Loreggia, Carlo Baffa, Pierre Y. Kern, Laurent Jocou, Fabien Malbet, and Patrick Rabou "Near-IR spectrograph of VSI (VLTI Spectro Imager): dispersing the light from an integrated optics beam-combiner", Proc. SPIE 7013, Optical and Infrared Interferometry, 701330 (28 July 2008); https://doi.org/10.1117/12.787272
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