Open AccessFresnel zone plate with apodized aperture for hard X‐ray Gaussian beam optics
Author(s) -
Takeuchi Akihisa,
Uesugi Kentaro,
Suzuki Yoshio,
Itabashi Seiichi,
Oda Masatoshi
Publication year - 2017
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577517003289
Subject(s) - apodization , zone plate , optics , fresnel zone , aperture (computer memory) , microbeam , gaussian , fresnel number , gaussian beam , physics , pupil function , beam (structure) , strehl ratio , diffraction , adaptive optics , quantum mechanics , acoustics
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.