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    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Ultrafast Science

    Background:

    • Achieving ultrashort laser pulses with high peak power is crucial for various scientific applications.
    • Pulse compression techniques are essential for reducing pulse durations and increasing peak intensities.
    • Small-scale self-focusing can limit the power scaling of high-intensity laser systems.

    Purpose of the Study:

    • To investigate the nonlinear compression of ultrashort laser pulses.
    • To demonstrate the suppression of small-scale self-focusing during pulse compression.
    • To explore the potential for scaling to multipetawatt power levels.

    Main Methods:

    • Utilized the PEARL laser system producing 60-70 fs pulses.
    • Employed a 5-mm thick silica plate for initial dispersion.
    • Used two chirping mirrors with a total dispersion of -250 fs² for further compression.
    • Conducted experiments with B-integral values up to 19.

    Main Results:

    • Successfully compressed laser pulses to a duration of 11 fs.
    • Observed no damage to optical elements at B-integral values up to 19, indicating suppressed self-focusing.
    • Demonstrated the feasibility of nonlinear compression scaling.

    Conclusions:

    • The developed method effectively compresses ultrashort laser pulses while mitigating self-focusing.
    • This technique shows promise for scaling to multipetawatt peak powers.
    • Further nonlinear compression is possible for pulses with durations approaching the field period.