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Proceedings Paper

Thermal baffling of SPHERE IFS
Author(s): Raffaele G. Gratton; Riccardo U. Claudi; Enrico Giro; Umberto Anselmi; Dino Mesa; Luigi Lessio; Vincenzo De Caprio; Enrico Mattaini; Salvo Incorvaia; Enrico Santambrogio; Salvo Scuderi; Jean Luc Beuzit; Kjetil Dohlen; Pascal Puget; Jean Louis Lizon; Reinhold J. Dorn; Markus Kasper
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Paper Abstract

IFS is one of the scientific channels of SPHERE, the new high contrast imager for the ESO VLT telescope. IFS is an integral field spectrograph for the near IR (up to 1.65 micron), using a Hawaii II detector. To simplify opto-mechanical design, IFS has no cold pupil. To reduce thermal background, a cold filter fabricated by JDSU has been placed about 30 mm in front of the detector. This filter allows reducing thermal background by more than a factor 104. We describe the design and implementation of the baffling required for proper use of this system: this includes a combination of a cold and a warm baffles, and appropriate choices of the coatings of the surfaces. We present the laboratory results obtained, which show that this system has a thermal background below 10 e-/s/pixels in the SPHERE working conditions.

Paper Details

Date Published: 22 September 2011
PDF: 6 pages
Proc. SPIE 8167, Optical Design and Engineering IV, 81671Q (22 September 2011); doi: 10.1117/12.896831
Show Author Affiliations
Raffaele G. Gratton, INAF - Osservatorio Astronomico di Padova (Italy)
Riccardo U. Claudi, INAF - Osservatorio Astronomico di Padova (Italy)
Enrico Giro, INAF - Osservatorio Astronomico di Padova (Italy)
Umberto Anselmi, INAF - Osservatorio Astronomico di Padova (Italy)
Dino Mesa, INAF - Osservatorio Astronomico di Padova (Italy)
Luigi Lessio, INAF - Osservatorio Astronomico di Padova (Italy)
Vincenzo De Caprio, INAF-IASF Milano (Italy)
Enrico Mattaini, INAF-IASF Milano (Italy)
Salvo Incorvaia, INAF-IASF Milano (Italy)
Enrico Santambrogio, INAF-IASF Milano (Italy)
Salvo Scuderi, INAF - Osservatorio Astrofisico di Catania (Italy)
Jean Luc Beuzit, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille (France)
Pascal Puget, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Jean Louis Lizon, European Southern Observatory (Germany)
Reinhold J. Dorn, European Southern Observatory (Germany)
Markus Kasper, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 8167:
Optical Design and Engineering IV
Jean-Luc M. Tissot; Laurent Mazuray; Rolf Wartmann; Jeffrey M. Raynor; Andrew Wood, Editor(s)

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