Coating induced phase shift and impact on Euclid imaging performance
2016
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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