The fiber-fed preslit of GIANO at T.N.G
A. Tozzi, E. Oliva, L. Origlia, C. Baffa, V. Biliotti, G. Falcini, E., Giani, M. Iuzzolino, F. Massi, N. Sanna, S. Scuderi, M. Sozzi

TL;DR
The paper describes the development and implementation of a fiber-fed preslit system for the GIANO cryogenic spectrograph at T.N.G., enabling flexible telescope interfacing and improved observational capabilities.
Contribution
It introduces a novel fiber feeding interface with a dual-fiber system, guiding, calibration, and nodding features for the GIANO spectrograph, adapting it to remote placement.
Findings
Successful integration of fiber-fed system with GIANO
Enhanced observational flexibility with dual fibers
Improved efficiency through image slicer implementation
Abstract
Giano is a Cryogenic Spectrograph located in T.N.G. (Spain) and commisioned 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 85\mu m core, was developed.Originally designed to work directly at the 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…
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