29 June 2006 The spectrometer optics of GIANO-TNG
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Abstract
GIANO is a cryogenic cross-dispersed spectrometer operating at near IR wavelengths (0.9-2.5 microns). The aim of the optical design is to obtain wide spectral coverage, high resolution, large throughput and high spectral stability in a sufficiently compact instrument which can be built and cooled using relatively simple and inexpensive technologies. This ambitious goal is achieved using a 3-mirrors anastigmat in double-pass which acts both as collimator and camera. The collimated beam has a diameter of 100 mm and feeds a commercial 23.2 lines/mm echelle grating. Cross-dispersion is performed by prisms which also operate in double pass. By inserting a flat mirror before the grating, the instrument changes its face (hence the name "GIANO") and transforms into a low resolution spectrometer with a unique combination of spectral coverage, resolution and efficiency.
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S. Gennari, S. Gennari, I. Mochi, I. Mochi, S. L. Donati, S. L. Donati, E. Oliva, E. Oliva, L. Origlia, L. Origlia, P. Sandri, P. Sandri, } "The spectrometer optics of GIANO-TNG", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62693Z (29 June 2006); doi: 10.1117/12.670261; https://doi.org/10.1117/12.670261
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