The fiber-fed preslit of GIANO at T.N.G.

A. Tozzi; E. Oliva; L. Origlia; C. Baffa; V. Biliotti; G. Falcini; E. Giani; Marcella Iuzzolino; F. Massi; N. Sanna; Salvo Scuderi; M. Sozzi

doi:10.1117/12.2054094

28 July 2014 The fiber-fed preslit of GIANO at T.N.G.

A. Tozzi, E. Oliva, L. Origlia, C. Baffa, V. Biliotti, G. Falcini, E. Giani, Marcella Iuzzolino, F. Massi, N. Sanna, Salvo Scuderi, M. Sozzi

Author Affiliations +

Proceedings Volume 9147, Ground-based and Airborne Instrumentation for Astronomy V; 91479N (2014) https://doi.org/10.1117/12.2054094
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Giano is a Cryogenic Spectrograph located in T.N.G. (Spain) and commissioned in 2013. It works in the range 950-2500 nm with a resolving power of 50000. This instrument was designed and built for direct feeding from the telescope [2]. 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. Originally designed to work directly at the f/11 nasmyth focus of the telescope, in 2011 it has decided to use a fiber to feed it. The beam from the telescope is focused on a double fiber boundle by a Preslit Optical Bench attached to the Nasmith A interface of the telescope. This Optical Bench contains the fiber feeding system and other important features as a guiding system, a fiber viewer, a fiber feed calibration lamp and a nodding facility between the two fibers. The use of two fibers allow us to have in the echellogram two spectrograms side by side in the same acquisition: one of the star and the other of the sky or simultaneously to have the star and a calibration lamp. Before entering the cryostat the light from the fiber is collected by a second Preslit Optical Bench attached directly to the Giano cryostat: on this bench the correct f-number to illuminate the cold stop is generated and on the same bench is placed an image slicer to increase the efficiency of the system.

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A. Tozzi, E. Oliva, L. Origlia, C. Baffa, V. Biliotti, G. Falcini, E. Giani, Marcella Iuzzolino, F. Massi, N. Sanna, Salvo Scuderi, and M. Sozzi "The fiber-fed preslit of GIANO at T.N.G.", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91479N (28 July 2014); https://doi.org/10.1117/12.2054094

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