29 July 2016 Coating induced phase shift and impact on Euclid imaging performance
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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, 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); doi: 10.1117/12.2232842; https://doi.org/10.1117/12.2232842
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