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    Talbot-Lau x-ray interferometry now uses moderate-energy lasers for phase-contrast imaging. This advancement allows for high-resolution measurements in plasma experiments and biological imaging.

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    Area of Science:

    • Physics
    • Optics
    • Materials Science

    Background:

    • Talbot-Lau x-ray interferometry is a grating-based technique for measuring refractive index changes with micrometer resolution.
    • Established with various hard x-ray sources, it has potential applications in optical ranges for low-density plasmas.

    Purpose of the Study:

    • To investigate the feasibility of Talbot-Lau phase-contrast imaging using a moderate-energy, high-repetition-rate laser system.
    • To demonstrate the applicability of laser-driven K-alpha sources for this interferometry technique.

    Main Methods:

    • Utilized a 100 mJ, 10 Hz laser to irradiate a copper foil, generating K-alpha x-rays.
    • Integrated results from up to 900 laser pulses to form interferometric images.
    • Employed correlation matrices for phase retrieval, compensating for displacement without ex-situ phase stepping.

    Main Results:

    • Achieved a constant fringe contrast of 20% over 100 accumulations.
    • Observed an increasing signal-to-noise ratio with the number of accumulated laser shots.
    • Demonstrated successful phase retrieval and agreement with theoretical predictions.

    Conclusions:

    • Talbot-Lau phase-contrast imaging is feasible with moderate-energy, high-repetition-rate laser systems.
    • This technique is applicable to various laser facilities and scientific disciplines, including plasma physics and biological imaging.
    • Future improvements are possible with more energetic laser systems.