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Two phase-matching regimes in high-order harmonic generation.

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    This summary is machine-generated.

    High-order harmonic generation (HHG) optimization was studied by varying gas pressure and medium length. Two optimal yield regimes were found, supporting a new analytical model for efficient extreme ultraviolet light production.

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    Area of Science:

    • Quantum Optics
    • Laser Physics
    • Attosecond Science

    Background:

    • High-order harmonic generation (HHG) produces coherent extreme ultraviolet (XUV) radiation.
    • Attosecond pulse durations are achievable with HHG.

    Purpose of the Study:

    • To systematically investigate harmonic yield based on gas pressure and medium length.
    • To identify optimal conditions for efficient HHG.

    Main Methods:

    • Experimental variation of gas pressure and medium length.
    • Measurement of harmonic yield.
    • Comparison with a recently proposed analytical model.

    Main Results:

    • Two distinct regimes for optimum harmonic yield were identified.
    • The findings are largely independent of focusing geometry, pulse duration, and laser intensity.
    • The results support predictions from a new analytical model.

    Conclusions:

    • A versatile approach for optimizing HHG was demonstrated.
    • Understanding the interplay of microscopic and macroscopic effects is key for efficient XUV generation.
    • The identified regimes offer practical guidance for HHG experiments.