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Figure 3
Schematic of the phase retrieval principle. On the left and right of the focus at x = e, two defocused CCD planes (Fig. 2[link]) at x = e ± Δx are indexed by i and j, respectively. Numbered rays (black dots), whose local density is proportional to I(r), are traced in a sequential order from the plane i to the plane j. The direction dir(S) = δr/δx of the Poynting vector for the nth ray (red) is proportional to the slope [\partial_{r}{\cal W}(r)], marked by the doubled grey line on the left, and differs from that of the perfect spherical phase by a small angle ϑ(r). The integration of this differential slope yields the wavefront error. The graphic is adopted from Probst et al. (2020aBB17).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 31| Part 4| July 2024| Pages 690-697
https://doi.org/10.1107/S1600577524003643
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