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Proceedings Paper

Tests of VPHGS in the NIR for use at cryogenic temperatures
Author(s): Maider Insausti; Francisco Garzón; Roque Madrigal; Antonio Fimia
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Paper Abstract

We report on the performances measured at room temperature, before and after a cryogenic cooling cycle, of a set of NIR Volume Phase Holographic Gratings (VPHGs) manufactured at the Miguel Hernández University (UMH, Elche, Spain) aimed at their use in astronomical instrumentations. VPHGs are novel optical components which can replace standard ruled transmission gratings, offering some advantages. Instead of a surface modulation, a diffraction index modulation printed in a volume of material generates the diffraction according to the required specifications. While VPHGs are becoming an option for instruments working in the optical regime at room temperature, their use is still minimal in the NIR wavebands due to the stringent requirements impose by the cryogenic environment. But their good properties in terms of high transmission and compact mechanical design are kept even in cryogenic, so efforts to develop such devices functional at cryogenic temperatures are underway in several institutions. We report results on transmission of newly manufactured VPHGs. These results were achieved through a collaborative effort within the European network OPTICON WP6, “New Materials and Processes in Astronomical Instrumentation”, and whose participating institutions are Instituto de Astrofísica de Canarias (IAC), Universidad Miguel Hernández, Osservatorio Astronomico di Brera (INAF) and Politecnico di Milano.

Paper Details

Date Published: 13 September 2012
PDF: 8 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84503M (13 September 2012); doi: 10.1117/12.926242
Show Author Affiliations
Maider Insausti, Instituto de Astrofísica de Canarias (Spain)
Francisco Garzón, Instituto de Astrofísica de Canarias (Spain)
Univ. de La Laguna (Spain)
Roque Madrigal, Univ. Miguel Hernández (Spain)
Antonio Fimia, Univ. Miguel Hernández (Spain)

Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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