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    The focal cone high harmonic generation (FCHHG) technique enables scalable extreme ultraviolet (XUV) generation with high energy lasers. This method creates self-focusing XUV beams, but is sensitive to laser spatial non-uniformity.

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    Area of Science:

    • Physics
    • Laser Science
    • Quantum Optics

    Background:

    • High harmonic generation (HHG) is a key process for producing extreme ultraviolet (XUV) radiation.
    • Scaling HHG to higher laser energies is crucial for advanced applications.
    • Current methods face limitations due to saturation intensity and atomic density.

    Purpose of the Study:

    • To investigate the focal cone high harmonic generation (FCHHG) technique for generating self-focusing XUV beams.
    • To demonstrate the scalability of HHG to high energy lasers.
    • To analyze the impact of laser spatial non-uniformity on the FCHHG process.

    Main Methods:

    • Utilizing the FCHHG geometry by passing a focusing laser beam through a gas sheet before the focal point.
    • Employing high energy lasers, including experiments with 400 TW pulses.
    • Analyzing the spectral signature and spatial profile of the generated XUV radiation.

    Main Results:

    • Successful generation of converging beams of high harmonic radiation.
    • Demonstrated scaling of HHG to high incident laser power.
    • Observed sensitivity of the FCHHG technique to spatial non-uniformities in the driving laser.

    Conclusions:

    • The FCHHG technique offers a scalable pathway for XUV generation with high energy lasers.
    • This method increases the XUV emission area without exceeding atomic saturation limits.
    • Mitigating spatial non-uniformities in high energy laser systems is critical for optimizing FCHHG performance.