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Proceedings Paper

The cold spectrograph of AMBER, the infrared beam-combiner for the VLTI
Author(s): Franco Lisi; Sandro Gennari; Paolo Stefanini; Matteo Accardo; Simone Busoni; Debora Ferruzzi; Elisabetta Giani
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Paper Abstract

The instrumentation for VLT/VLTI 1 facility of the European Southern Observatory at Paranal (Chile)includes the infrared beam-combiner called AMBER, that covers the near infrared bands up to 2.5 μm. The cold spectrograph we describe is the AMBER subsystem responsible of wavelength analysis and several other functions, all of them performed by means of optics, analyzers, and mechanisms working at the temperature of liquid nitrogen boiling at atmospheric pressure. The cryo-mechanical design of the spectrograph we describe here used extensively the methods of finite element analysis and the laboratory tests validated this approach. The final optical quality we measured in the laboratory before shipping the instrument to Grenoble or integration (December 2002),is well inside the specification the AMBER staff assigned to the spectrograph. Simulations show that its total contribution to visibility loss of AMBER is less than 2%.

Paper Details

Date Published: 15 October 2003
PDF: 7 pages
Proc. SPIE 5172, Cryogenic Optical Systems and Instruments X, (15 October 2003); doi: 10.1117/12.508376
Show Author Affiliations
Franco Lisi, Osservatorio Astrofisico di Arcetri (Italy)
Sandro Gennari, Osservatorio Astrofisico di Arcetri (Italy)
Paolo Stefanini, Osservatorio Astrofisico di Arcetri (Italy)
Matteo Accardo, European Southern Observatory (Germany)
Simone Busoni, Osservatorio Astrofisico di Arcetri (Italy)
Debora Ferruzzi, Osservatorio Astrofisico di Arcetri (Italy)
Elisabetta Giani, Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 5172:
Cryogenic Optical Systems and Instruments X
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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