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Figure 9
The first-order diffraction maximum of the FZP lens creates a small focus at the focal point. The first-order diffraction maximum results in a broad intensity distribution of size 2D at the focal spot. The waveguide of width W only captures a fraction W/D of this flux (doubled because of the pre-reflection), and the angular distribution of these waves has a width of W/f.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 9| Part 6| November 2002| Pages 383-393
doi:10.1107/S0909049502016308
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