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    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Laser physics

    Background:

    • The Kerr nonlinearity is crucial for understanding light-matter interactions.
    • Its behavior at extreme intensities, where ionization occurs, remains debated.
    • Accurate characterization is vital for advanced optical applications.

    Purpose of the Study:

    • To introduce and analyze a novel concept for measuring Kerr nonlinearity at extreme intensities.
    • To investigate the non-perturbative regime of nonlinear optics.
    • To provide a method for extracting the functional form and magnitude of Kerr nonlinearity.

    Main Methods:

    • Theoretical analysis of a novel concept.
    • Utilizing seeded Kerr instability amplification.
    • Identifying unique signatures for nonlinearity extraction.

    Main Results:

    • Demonstrated the feasibility of the proposed concept.
    • Showcased that seeded Kerr instability amplification yields clear signatures.
    • Established a pathway to extract Kerr nonlinearity in the non-perturbative limit.

    Conclusions:

    • The proposed concept offers a viable approach to study extreme-intensity nonlinear optics.
    • Seeded Kerr instability amplification is a powerful tool for characterizing nonlinear optical properties.
    • This work resolves ambiguities regarding the Kerr nonlinearity at high intensities.