Coating induced phase shift and impact on Euclid imaging performance

Luis M. Gaspar Venancio; Lionel Carminati; Jose Lorenzo Alvarez; Jérôme Amiaux; Luciana Bonino; Jean-Christophe Salvignol; Roland Vavrek; René Laureijs; Alex Short; Tobias Boenke; Paulo Strada

doi:10.1117/12.2232842

29 July 2016 Coating induced phase shift and impact on Euclid imaging performance

Luis M. Gaspar Venancio, Lionel Carminati, Jose Lorenzo Alvarez, Jérôme Amiaux, Luciana Bonino, Jean-Christophe Salvignol, Roland Vavrek, René Laureijs, Alex Short, Tobias Boenke, Paulo Strada

Author Affiliations +

Proceedings Volume 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave; 99040V (2016) https://doi.org/10.1117/12.2232842
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The challenging constraints imposed on the Euclid telescope imaging performances have driven the design, manufacturing and characterisation of the multi-layers coatings of the dichroic. Indeed it was found that the coatings layers thickness inhomogeneity will introduce a wavelength dependent phase-shift resulting in degradation of the image quality of the telescope. Such changes must be characterized and/or simulated since they could be non-negligible contributors to the scientific performance accuracy. Several papers on this topic can be found in literature, however the results can not be applied directly to Euclid’s dichroic coatings. In particular an applicable model of the phase-shift variation with the wavelength could not be found and was developed. The results achieved with the mathematical model are compared to experimental results of tests performed on a development prototype of the Euclid’s dichroic.

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Luis M. Gaspar Venancio, Lionel Carminati, Jose Lorenzo Alvarez, Jérôme Amiaux, Luciana Bonino, Jean-Christophe Salvignol, Roland Vavrek, René Laureijs, Alex Short, Tobias Boenke, and Paulo Strada "Coating induced phase shift and impact on Euclid imaging performance", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99040V (29 July 2016); https://doi.org/10.1117/12.2232842

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KEYWORDS

Coating

Telescopes

Mathematical modeling

Image quality

Space telescopes

Reflectivity

Point spread functions

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