Coherent hard x‐ray focusing optics and applications
Coherent hard x‐ray beams with a flux exceeding 109 photons/sec with a bandwidth of 0.1% will be provided by undulators at the third‐generation synchrotron radiation sources such as APS, ESRF, and Spring‐8. The availability of such high flux coherent x‐ray beams offers excellent opportunities for ex...
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Veröffentlicht in: | Review of Scientific Instruments 1992-01, Vol.63 (1), p.582-585 |
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Sprache: | eng |
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Zusammenfassung: | Coherent hard x‐ray beams with a flux exceeding 109 photons/sec with a bandwidth of 0.1% will be provided by undulators at the third‐generation synchrotron radiation sources such as APS, ESRF, and Spring‐8. The availability of such high flux coherent x‐ray beams offers excellent opportunities for extending the coherence‐based techniques developed in the visible and soft x‐ray part of the electromagnetic spectrum to the hard x‐ray region. These x‐ray techniques (e.g., diffraction‐limited microfocusing, holography, interferometry, phase contrast imaging, and signal enhancement) may offer substantial advantages over noncoherence‐based x‐ray techniques currently used. For example, the signal‐enhancement technique may be used to enhance an anomalous x‐ray or magnetic x‐ray scattering signal by several orders of magnitude. Coherent x rays can be focused to a very small (diffraction‐limited) spot size, thus allowing construction of high spatial resolution microprobes. This paper will discuss the feasibility of extending some coherence‐based techniques to the hard x‐ray range and the significant progress that has been made in the development of diffraction‐limited focusing optics. Specific experimental results for a transmission Fresnel phase zone plate that can focus 8.2 keV x rays to a spot size of about 2 microns will be briefly discussed. The comparison of measured focusing efficiency of the zone plate with that calculated will be made. Some specific applications of zone plates as coherent x‐ray optics will be discussed. |
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ISSN: | 0034-6748 1089-7623 |
DOI: | 10.1063/1.1142711 |