An integral field spectrograph concept has been developed for the SNAP/ JDEM (SuperNova/Acceleration Probe) experiment. This spectrograph will be optimized for faint supernovae and galaxies in a 3 × 6 arsec~2 at low spectral resolution (R～100) through the wavelength range (0.35-1.7 μm). The integral field method is based on glass image slicer. A prototype of this instrument has been build to validate the concept and prove the optical and functional requirements of the SNAP spectrograph.In this paper, we present the first results of this demonstrator. We describe the demonstrator philosophy, set up and functional performances. We present then the first experimental results obtained in the visible range. We validate the slicer optical quality through a set of measurements: PSF, optical losses.
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