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Proceedings Paper

Near-IR spectrograph of VSI (VLTI Spectro Imager): dispersing the light from an integrated optics beam-combiner
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Paper 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.

Paper Details

Date Published: 28 July 2008
PDF: 12 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 701330 (28 July 2008); doi: 10.1117/12.787272
Show Author Affiliations
Dario Lorenzetti, INAF, Osservatorio Astronomico di Roma (Italy)
Gianluca Li Causi, INAF, Osservatorio Astronomico di Roma (Italy)
Roberto Speziali, INAF, Osservatorio Astronomico di Roma (Italy)
Fabrizio Vitali, INAF, Osservatorio Astronomico di Roma (Italy)
Davide Loreggia, INAF, Osservatorio Astronomico di Torino (Italy)
Carlo Baffa, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Pierre Y. Kern, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Laurent Jocou, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Fabien Malbet, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Patrick Rabou, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)


Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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