29 June 2006 The spectrometer optics of GIANO-TNG
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Gennari, I. Mochi, S. L. Donati, E. Oliva, L. Origlia, 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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