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Figure 1
Left: scheme of the soft X-ray FTS device. BS1 and BS2 are beam splitters of the same structure with a one-grating-period offset relative to each other. M1, M2, M3, and M4 are mirrors that form the rhombus geometry. The beam path is highlighted in blue, and the driving stage is highlighted in purple. Top right: scheme of the second beam splitter BS2 (the beam combiner). Light blue is light from the M3M4 arm that is reflected at BS2, and dark blue is light from the M1M2 arm transmitting through. Bottom right: scheme of the first beam splitter BS1. Light blue represents light from the source being reflected into the M1M2 arm, and dark blue is radiation transmitting through, into the M3M4 arm of the FTS device.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 2| March 2026| Pages 362-373
https://doi.org/10.1107/S1600577525011452
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