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15 October 2003 The cold spectrograph of AMBER, the infrared beam-combiner for the VLTI
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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%.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Franco Lisi, Sandro Gennari, Paolo Stefanini, Matteo Accardo, Simone Busoni, Debora Ferruzzi, and Elisabetta Giani "The cold spectrograph of AMBER, the infrared beam-combiner for the VLTI", Proc. SPIE 5172, Cryogenic Optical Systems and Instruments X, (15 October 2003);


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