期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 24, 期 -, 页码 586-594出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577517003289
关键词
Fresnel zone plate; X-ray microscopy; apodization; Gaussian beam optics
Fresnel zone plates with apodized apertures [apodization FZPs (A-FZPs)] have been developed to realise Gaussian beam optics in the hard X-ray region. The designed zone depth of A-FZPs gradually decreases from the center to peripheral regions. Such a zone structure forms a Gaussian-like smooth-shouldered aperture function which optically behaves as an apodization filter and produces a Gaussian-like focusing spot profile. Optical properties of two types of A-FZP, i.e. a circular type and a one-dimensional type, have been evaluated by using a microbeam knife-edge scan test, and have been carefully compared with those of normal FZP optics. Advantages of using A-FZPs are introduced.
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