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, Jean Louis Lizon, Barbara Klein, Barbara Klein, Ernesto Oliva, Ernesto Oliva, Tom Löwinger, Tom Löwinger, Guillem Anglada Escude, Guillem Anglada Escude, Dietrich Baade, Dietrich Baade, Paul Bristow, Paul Bristow, Reinhold J. Dorn, Reinhold J. Dorn, Roman Follert, Roman Follert, Jason Grunhut, Jason Grunhut, Artie Hatzes, Artie Hatzes, Ulrike Heiter, Ulrike Heiter, Derek Ives, Derek Ives, Yves Jung, Yves Jung, Florian Kerber, Florian Kerber, Matt Lockhart, Matt Lockhart, Thomas Marquart, Thomas Marquart, Livia Origlia, Livia Origlia, Luca Pasquini, Luca Pasquini, Jerome Paufique, Jerome Paufique, N. Piskunov, N. Piskunov, Eszter Pozna, Eszter Pozna, Ansgar Reiners, Ansgar Reiners, Alain Smette, Alain Smette, Jonathan Smoker, Jonathan Smoker, Ulf Seemann, Ulf Seemann, Eric Stempels, Eric Stempels, Elena Valenti, 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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