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Figure 4
(a) Impulse response function Iδ for a Be lens with f = 3 m, a beam size 755 µm FWHM, and a photon energy of 12 keV. The solid blue line considers the corresponding group velocity inside the lenses material; the dashed orange line neglects the reduced group velocity. (b) Pulse-stretching effect of a 200 as FWHM Gaussian pulse. For the Fresnel theory plot the intensity is spatially integrated. Note that the ray-tracing approach yields a result extremely similar to the one using the Fresnel theory.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 1| January 2026| Pages 52-62
https://doi.org/10.1107/S1600577525008975
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