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Related Experiment Video

Updated: Feb 20, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Grating interferometer for light-efficient spatial coherence measurement of arbitrary sources.

Matias Koivurova, Henri Partanen, Jari Turunen

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    Summary
    This summary is machine-generated.

    A novel z-scanning double-grating interferometer efficiently measures spatial coherence for various light sources. This technique offers high light efficiency and broad applicability, surpassing traditional methods.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Coherence Theory

    Background:

    • Spatial coherence is crucial for understanding light propagation and imaging.
    • Classical methods like Young's interferometer have limitations in efficiency and applicability.
    • Measuring spatial coherence in both space-frequency and space-time domains is essential.

    Purpose of the Study:

    • To theoretically analyze and experimentally verify a z-scanning double-grating interferometer.
    • To enable efficient measurement of spatial coherence between arbitrary points.
    • To extend coherence measurements to broadband and non-Schell model sources.

    Main Methods:

    • Development of a z-scanning double-grating interferometer setup.
    • Experimental verification using narrowband and broadband light sources.
    • Comparison with results from Young's interferometer implemented with a digital micromirror device.

    Main Results:

    • The interferometer successfully measures spatial coherence in space-frequency and space-time domains.
    • High light efficiency is achieved compared to Young's experiment.
    • The method is applicable to quasi-monochromatic and broadband sources, including discrete and continuous spectra.

    Conclusions:

    • The z-scanning double-grating interferometer is a versatile and efficient tool for spatial coherence measurements.
    • The technique accurately retrieves the complex degree of spatial coherence for broadband sources.
    • This method advances coherence analysis for diverse optical phenomena and applications.