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Figure 1
Schematic of the waveguide setup with the pre-focusing lens (not to scale). The guiding layer of the waveguide is the gap in between the two closely spaced surfaces on the right. The dark layers in the substrates are the aluminium layers that form the optical interferometer for the FECO technique (see text). The incident beam is focused on the entrance of the waveguide by a transmission Fresnel-zone-plate lens, which can be removed. By rotating the lens around the axis indicated by the dashed line, the effective path length through the Fresnel zones can be adjusted to achieve optimal efficiency.

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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