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15 July 2010 GPI: cryogenic spectrograph optics performances
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The science instrument for GPI (Gemini Planet Imager) is a cryogenic integral field spectrograph based on a lenslet array. The integral field nature of the instrument allows for a full mapping of the focal plane at coarse spectral resolution. With such a data cube, artifacts within the PSF such as residual speckles can be suppressed. Additionally, the initial detection of any candidate planet will include spectral information that can be used to distinguish it from a background object: candidates can be followed up with detailed spectroscopic observations. The optics between the lenslet array and the detector are essentially a standard spectrograph with a collimating set of lenses, a dispersive prism and a camera set of lenses in a folded assembly. We generally refer to this optical set as the spectrograph optics. This paper describes the laboratory optical performances over the field of view. The test procedure includes the imaging performances in both non dispersive and dispersive mode. The test support equipments include a test cryostat, an illumination module with monochromatic fiber laser, a wideband light source and a test detector module.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Thibault, P. Vallée, E. Artigau, J. Maire, R. Doyon, J.-F. Lavigne, and J. Larkin "GPI: cryogenic spectrograph optics performances", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77351N (15 July 2010);

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