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Updated: Jul 26, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Modified Mach-Zehnder interferometer for spatial coherence measurement.

F J Torcal-Milla, J Lobera, E M Roche

    Optics Letters
    |June 15, 2023
    PubMed
    Summary
    This summary is machine-generated.

    A modified Mach-Zehnder interferometer offers a robust method for measuring light source spatial coherence. This new setup simplifies coherence degree determination, aiding in optimizing laser configurations for interferometry.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Laser Physics

    Background:

    • Classical Young's interferometer is standard for spatial coherence measurement.
    • Existing methods require multiple point pairs and can be cumbersome.
    • Limitations in classical setups hinder efficient characterization of complex coherence.

    Purpose of the Study:

    • To present a modified Mach-Zehnder interferometer for spatial coherence measurement.
    • To enable measurement of the full 4D spatial coherence function.
    • To offer a robust, portable, and simplified alternative to existing methods.

    Main Methods:

    • A modified Mach-Zehnder interferometer incorporating lenses was developed.
    • Lateral displacement of the incoming beam allows for 4D spatial coherence mapping.
    • A 2D projection (zero shear) was measured to characterize sources.
    • The system was tested on a high-speed two-cavity laser.

    Main Results:

    • The modified interferometer successfully measured spatial coherence.
    • Complex coherence degree was observed to vary with laser pulse energy.
    • Both laser cavities showed similar, though not symmetrical, complex coherence degrees at maximum energy.

    Conclusions:

    • The modified Mach-Zehnder interferometer provides a robust and portable solution for spatial coherence measurement.
    • The technique allows for the determination of optimal laser configurations for interferometric applications.
    • This approach is applicable to various light sources beyond the tested laser.