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Cryogenic optical performance verification methods for optical components, coatings and optical systems

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Author: Navarro, R. · Elswijk, E. · Voert, M.J.A. te · Venema, L.
Publisher: SPIE
Source:International Conference on Space Optics, ICSO 2014, 7-10 October 2014, La Caleta, Tenerife, Canary Islands, Sodnik, Z.Cugny, B.Karafolas, N., 10563
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 842149
doi: doi:10.1117/12.2304225
ISBN: 9781510616158
Article number: 1056349
Keywords: Coatings · Cryogenics · Space optics · Optical systemOptical components · Space & Scientific Instrumentation · Industrial Innovation · Mechatronics, Mechanics & Materials · OM - Opto-Mechatronics · TS - Technical Sciences


NOVA-ASTRON has delivered a suite of cryogenic astronomical instruments for large ground based telescopes as well as space missions. The instruments include polarimeters, spectrometers, cameras and interferometers, mostly operating at infrared. Several methods have been developed to verify or measure, under cryogenic conditions, the performance of optical components, coatings and complete optical systems. The test and verification setups presented in this paper include wave front error measurements, alignment inspection, spectral measurements, material properties determination and varying gravity orientation capabilities (gravity load vector). The measurement principles are explained, together with the most important error contributions and the achieved accuracies.