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Extension of high-harmonic generation cutoff in solids to 50 eV using MgO.

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    Researchers achieved a record 50 eV photon energy using high-harmonic generation in solids. This breakthrough in extreme ultraviolet (XUV) radiation generation paves the way for more compact XUV sources.

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    Area of Science:

    • Solid-state physics
    • Quantum optics
    • Laser-driven phenomena

    Background:

    • High-harmonic generation (HHG) in solids offers a pathway to compact extreme ultraviolet (XUV) sources.
    • Previous HHG in solids was limited to photon energies below 40 eV.

    Purpose of the Study:

    • To achieve photon energies exceeding 40 eV in solid-state HHG.
    • To explore the potential of solid-state media for generating high-energy XUV radiation.

    Main Methods:

    • Utilized femtosecond laser pulses (780 nm, 30 fs) to drive HHG in a 100-µm-thick MgO sample.
    • Optimized spectrometer and detection efficiency.
    • Increased emission efficiency via a larger excitation area and multi-cycle pulses.

    Main Results:

    • Achieved a record photon energy of 50 eV (31st harmonic) in MgO.
    • Observed nontrivial behavior in the harmonic cutoff as a function of laser field strength.

    Conclusions:

    • Demonstrated the potential for compact XUV sources beyond 50 eV using solid-state media.
    • The observed cutoff behavior suggests a need for refining current HHG theories.