Near-IR Spectrograph for VSI (VLTI Spectro Imager): dispersing the light from an integrated optics beam-combiner

Details Near-IR Spectrograph for VSI (VLTI Spectro Imager): dispersing the light from an integrated optics beam-combiner Near-IR Spectrograph for VSI (VLTI Spectro Imager): dispersing the light from an integrated optics beam-combiner

2008-07-10

arxiv.org/abs/0807.1617v1

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, SPIE Conference - Marseille 2008

Scientific paper

10.1117/12.787272

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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