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Updated: Jun 1, 2026
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Partially coherent nano-focused x-ray radiation characterized by Talbot interferometry
T Salditt1, S Kalbfleisch, M Osterhoff
1Institut für Röntgenphysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
Optics Express
|June 7, 2011
Summary
We investigated nano-focused X-ray beam coherence using Talbot interferometry. X-ray waveguides significantly enhanced beam coherence and reduced spot size for advanced imaging applications.
Area of Science:
- Optics and Photonics
- X-ray Science and Technology
- Nanotechnology
Background:
- Nano-focused X-ray beams are crucial for high-resolution imaging.
- Understanding spatial coherence is vital for optimizing beam performance.
- Partial coherence in X-ray optics affects imaging fidelity.
Purpose of the Study:
- To characterize the spatial coherence of a nano-focused X-ray beam.
- To evaluate the impact of coherence on imaging applications.
- To demonstrate coherence enhancement using X-ray waveguides.
Main Methods:
- Talbot interferometry was employed to measure spatial coherence in projection geometry.
- A fixed curvature mirror system was used for X-ray beam focusing.
- Numerical calculations were performed to model coherence propagation.
- In-line imaging of a test pattern under partial coherence was analyzed.
- X-ray waveguides were used for coherence filtering and beam size reduction.
Main Results:
- Spatial coherence of the divergent exit wave from the mirror focus was successfully measured.
- Results were validated against numerical coherence propagation calculations.
- Quantitative analysis of magnified images revealed imaging performance under partial coherence.
- X-ray waveguides reduced beam diameter from 200 nm to below 15 nm.
- Waveguide insertion increased numerical aperture and coherence length.
Conclusions:
- Talbot interferometry is effective for quantifying spatial coherence in nano-focused X-ray beams.
- X-ray waveguides are a viable method for enhancing beam coherence and enabling nanoscale imaging.
- The study provides insights into optimizing X-ray optics for advanced applications.
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