29 July 2016 Coating induced phase shift and impact on Euclid imaging performance
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Luis M. Gaspar Venancio, Luis M. Gaspar Venancio, Lionel Carminati, Lionel Carminati, Jose Lorenzo Alvarez, Jose Lorenzo Alvarez, Jérôme Amiaux, Jérôme Amiaux, Luciana Bonino, Luciana Bonino, Jean-Christophe Salvignol, Jean-Christophe Salvignol, Roland Vavrek, Roland Vavrek, René Laureijs, René Laureijs, Alex Short, Alex Short, Tobias Boenke, Tobias Boenke, Paulo Strada, 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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