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Figure 1
(a) Sketch of an ideal paraboloid X-ray lens. Refractive index n = 1 − δ < 1, such that the phase velocity in the lens cph > c0, while the group velocity cgr < c0. (b) Temporal intensity profile I(t) evaluated in the focal plane. Unfocused X-ray pulse (blue, solid), focused pulse at r = 0 (orange, dashed) and spatially integrated over the focus plane (green, dotted). The displayed pulses were individually scaled such that their maximum is unity. The incoming pulse has a duration of 200 as FWHM, a size of 755 µm FWHM and mean photon energy E0 = 12 keV. The assumed Be lens has a focal length of f = 3 m. Note that the pulse at r = 0 is more delayed and wider (345 as FWHM) than the spatially integrated one (318 as FWHM).

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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