Theoretical analysis and optimization of highly efficient multilayer-coated blazed gratings with high fix-focus constant for the tender X-ray region
| Autor: | Zhanshan Wang, Jiangtao Feng, Andrey Sokolov, Qiushi Huang, Zhong Zhang, Jens Viefhaus, Igor V. Kozhevnikov, Yeqi Zhuang, Frank Siewert, Tongzhou Li |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Materials science business.industry X-ray Physics::Optics 02 engineering and technology Grating 021001 nanoscience & nanotechnology Diffraction efficiency 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics 0103 physical sciences X-ray crystallography 0210 nano-technology Focus (optics) Constant (mathematics) business Diffraction grating |
| Zdroj: | Optics express. 28(2) |
| ISSN: | 1094-4087 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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