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Updated: Apr 27, 2026
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
9.1K
Probing transverse coherence of x-ray beam with 2-D phase grating interferometer
Optics Express
|July 1, 2014
Summary
This study investigated x-ray beam transverse coherence using a phase grating. Optimal measurement occurs along diagonal directions, ensuring higher visibility and robustness against grating imperfections.
Area of Science:
- Optics and Photonics
- X-ray Science
- Coherence Theory
Background:
- Understanding transverse coherence is crucial for advanced imaging and experiments.
- Bending magnet sources are common in synchrotron facilities.
- Characterizing beam coherence impacts experimental precision.
Purpose of the Study:
- To investigate the transverse coherence of x-ray beams from bending magnet sources.
- To determine optimal measurement orientations for 2-D gratings.
- To validate measurement accuracy using simulations.
Main Methods:
- Utilized a 2-D π/2 phase grating to measure interferogram visibilities.
- Analyzed coherence along multiple directions at varying distances.
- Performed wavefront propagation simulations for verification.
Main Results:
- Preferred measurement orientation for 2-D gratings is along diagonal directions.
- Higher interferogram visibility observed along diagonals.
- Measurements are insensitive to duty cycle deviations in this orientation.
Conclusions:
- The study identifies optimal conditions for measuring x-ray transverse coherence.
- Validated measurement accuracy through simulations and analytical methods.
- Demonstrated the technique's capability for spatially resolved coherence probing.
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