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Two-dimensional spectral interferometry in the extreme-ultraviolet enabled by computational phase-stabilization.

Lina Hedewig, Carlo Kleine, Felix Wieder

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    |December 19, 2025
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    Summary
    This summary is machine-generated.

    This study introduces two-dimensional spectral interferometry (2DSI) for extreme ultraviolet (XUV) light analysis. This method enhances interferometer stability and accurately measures spectral phase in XUV pulses.

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    Area of Science:

    • Physics
    • Quantum Optics
    • Spectroscopy

    Background:

    • Spectral interferometry is a powerful technique for measuring optical properties.
    • Extreme ultraviolet (XUV) light presents unique challenges for interferometric measurements due to its short wavelength and high energy.
    • Existing methods lack the precision required for detailed analysis of XUV-matter interactions.

    Purpose of the Study:

    • To adapt spectral interferometry for the extreme ultraviolet (XUV) spectral region.
    • To develop a robust method for measuring spectral phase in XUV pulses.
    • To demonstrate the technique's effectiveness near the neon absorption line.

    Main Methods:

    • Implementation of two-dimensional spectral interferometry (2DSI) by introducing a spatial dimension through beam tilting.
    • Application of computational phase stabilization using the intrinsic phase stability within a single XUV pulse.
    • Post-processing correction for interferometric instabilities, achieving attosecond stability.

    Main Results:

    • Successful transfer of spectral interferometry to the XUV spectral range.
    • Achieved an effective interferometer stability of 1.06 attoseconds.
    • Accurate extraction of the spectral phase imprinted on transmitted XUV pulses near the neon 2s2p63p absorption line.

    Conclusions:

    • The combination of 2DSI and computational phase stabilization significantly enhances XUV spectral interferometry.
    • This technique provides unprecedented precision for characterizing XUV-matter interactions.
    • The developed method opens new avenues for ultrafast science in the XUV domain.