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    Area of Science:

    • Nonlinear optics
    • Ultrafast lasers
    • Fiber optics

    Background:

    • High peak power ultrashort pulses are crucial for many applications.
    • Fiber nonlinearities and self-focusing limit achievable pulse peak power.
    • Existing methods face challenges with energy scaling and fiber damage.

    Purpose of the Study:

    • To present a novel method for nonlinear pulse compression using temporally divided pulses.
    • To demonstrate the feasibility of exceeding self-focusing thresholds in solid-core fibers.
    • To achieve compressed pulse durations below 100 femtoseconds (fs).

    Main Methods:

    • A single 320 fs pulse was divided into four temporal replicas.
    • Spectral broadening of the pulse replicas was performed in a solid-core fiber.
    • The spectrally broadened replicas were subsequently recombined.

    Main Results:

    • The approach enabled the use of a total input peak power of approximately 13.3 MW.
    • This peak power was over three times higher than the self-focusing threshold.
    • The combined output pulse was compressed to a duration of sub-100 fs.

    Conclusions:

    • The demonstrated technique offers a general and universal approach for pulse compression.
    • This method can overcome fundamental limitations in pulse peak power.
    • It shows promise for high-energy hollow-core fiber compression by mitigating fiber destruction and ionization.