24 July 2014 Opto-mechanical design of a new cross dispersion unit for the CRIRES+ high resolution spectrograph for the VLT
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CRIRES is one of the few IR (0.92-5.2 μm) high-resolution spectrographs in operation at the VLT since 2006. Despite good performance it suffers a limitation that significantly hampers its ability: a small spectral coverage per exposure. The CRIRES upgrade (CRIRES+) proposes to transform CRIRES into a cross-dispersed spectrograph while maintaining the high resolution (100000) and increasing the wavelength coverage by a factor 10 compared to the current capabilities. A major part of the upgrade is the exchange of the actual cryogenic pre-disperser module by a new cross disperser unit. In addition to a completely new optical design, a number of important changes are required on key components and functions like the slit unit and detectors units. We will outline the design of these new units fitting inside a predefined and restricted space. The mechanical design of the new functions including a description and analysis will be presented. Finally we will present the strategy for the implementation of the changes.
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Jean Louis Lizon, Barbara Klein, Ernesto Oliva, Tom Löwinger, Guillem Anglada Escude, Dietrich Baade, Paul Bristow, Reinhold J. Dorn, Roman Follert, Jason Grunhut, Artie Hatzes, Ulrike Heiter, Derek Ives, Yves Jung, Florian Kerber, Matt Lockhart, Thomas Marquart, Livia Origlia, Luca Pasquini, Jerome Paufique, N. Piskunov, Eszter Pozna, Ansgar Reiners, Alain Smette, Jonathan Smoker, Ulf Seemann, Eric Stempels, Elena Valenti, "Opto-mechanical design of a new cross dispersion unit for the CRIRES+ high resolution spectrograph for the VLT", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91477S (24 July 2014); doi: 10.1117/12.2054800; https://doi.org/10.1117/12.2054800

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