Open AccessTheoretical analysis and optimization of highly efficient multilayer-coated blazed gratings with high fix-focus constant for the tender X-ray region
Author(s) -
Qiushi Huang,
И. В. Кожевников,
Andréy Sokolov,
Yeqi Zhuang,
Tongzhou Li,
Jiangtao Feng,
Frank Siewert,
Jens Viefhaus,
Zhong Zhang,
Zhanshan Wang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.28.000821
Subject(s) - diffraction efficiency , diffraction , optics , diffraction grating , blazed grating , grating , materials science , focus (optics) , constant (computer programming) , ptychography , range (aeronautics) , optoelectronics , physics , computer science , composite material , programming language
The problem of X-ray diffraction from multilayer-coated blazed diffraction gratings is analyzed. Invalidity of the conventional condition of maximal diffraction efficiency observed in previous experiments is explained theoretically. This is attributed to two factors: contribution of anti-blaze facets to diffraction efficiency and effect of strongly asymmetric diffraction. We demonstrate that a proper choice of the multilayer d-spacing allows to design grating with the diffraction efficiency close to the maximal possible one throughout the tender X-ray range (E∼1-5 keV). An optimization procedure is suggested for the first time to choose the optimal grating parameters and the operation diffraction order to obtain a high fix-focus constant and high diffraction efficiency simultaneously in a wide spectral range.