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Proceedings Paper

Preliminary results on the characterization and performances of ZBLAN fiber for infrared spectrographs
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Paper Abstract

Present telescopes and future extremely large telescopes make use of fiber-fed spectrographs to observe at optical and infrared wavelengths. The use of fibers largely simplifies the interfacing of the spectrograph to the telescope. At a high spectral resolution (R>50,000) the fibers can be used to achieve very high spectral accuracy. GIANO is an infrared (0.95-2.5μm) high resolution (R=50,000) spectrometer[1] [2] [3] that was recently commissioned at the TNG telescope (La Palma). This instrument was designed and built for direct feeding from the telescope [4]. However, due to constraints imposed on the telescope interfacing during the pre-commissioning phase, it had to be positioned on the rotating building, far from the telescope focus. Therefore, a new interface to the telescope, based on IR-transmitting ZBLAN fibers with 85μm core, was developed. In this article we report the first, preliminary results of the effects of these fibers on the quality of the recorded spectra with GIANO and with a similar spectrograph that we set-up in the laboratory. The effects can be primarily associated to modal-noise (MN) that, in GIANO, is much more evident than in optical spectrometers, because of the much longer wavelengths.

Paper Details

Date Published: 28 July 2014
PDF: 11 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914766 (28 July 2014); doi: 10.1117/12.2055093
Show Author Affiliations
Marcella Iuzzolino, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Tozzi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
N. Sanna, INAF - Osservatorio Astrofisico di Arcetri (Italy)
L. Zangrilli, INAF - Osservatorio Astrofisico di Arcetri (Italy)
E. Oliva, INAF - Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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