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Figure 4
Sketch of the optical layout: (a) a rotating diffusor to reduce the coherence (optional); (b) a guard slit, central stop and beamshaping condenser: this ensemble provides the illumination. Note that the guard slits are only necessary because the beam size is larger than size of the order-sorting aperture. (c) The order-sorting aperture allows only the first diffraction order of the BSC to pass; (d) the sample is mounted in the working position of the optics; (e) the FZP focuses the magnified image of the sample on the detector system (g). Zernike phase rings (f) can be installed in the back-focal plane to change the contrast mechanism from absorption to phase contrast.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 1| January 2022| Pages 138-147
https://doi.org/10.1107/S1600577521011206
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