Thermal baffling of SPHERE IFS

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

doi:10.1117/12.896831

22 September 2011 Thermal baffling of SPHERE IFS

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

Author Affiliations +

Proceedings Volume 8167, Optical Design and Engineering IV; 81671Q (2011) https://doi.org/10.1117/12.896831
Event: SPIE Optical Systems Design, 2011, Marseille, France

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.

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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, and Markus Kasper "Thermal baffling of SPHERE IFS", Proc. SPIE 8167, Optical Design and Engineering IV, 81671Q (22 September 2011); https://doi.org/10.1117/12.896831

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KEYWORDS

Iterated function systems

Sensors

Optical filters

Cameras

Reflection

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