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Dispersion engineering in nonlinear multipass cells for high-quality pulse compression.

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    Engineered multipass cells with dispersive mirrors improve laser pulse quality by reshaping nonlinear interactions. This method significantly enhances spectral broadening and pulse compression, achieving 32 fs pulses from 205 fs.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Ultrashort pulse generation and amplification are critical for various scientific and industrial applications.
    • Achieving high-quality compressed pulses often faces challenges related to nonlinear spectral broadening and dispersion management.
    • Multipass cells offer compact solutions for enhancing light-matter interactions, but optimizing them for pulse compression requires careful engineering.

    Purpose of the Study:

    • To demonstrate a dispersion-engineered multipass cell for enhanced frequency chirping.
    • To improve the quality of compressed ultrashort laser pulses.
    • To showcase the potential of dispersion-tailored pulse compression in a multipass cell setup.

    Main Methods:

    • Utilizing dispersive cavity mirrors within a multipass cell to engineer the dispersion properties.
    • Operating the multipass cell in an enhanced frequency regime to reshape nonlinear interactions.
    • Employing an Yb:fiber laser system with 70 W average power and 50 kHz repetition rate as the input source.

    Main Results:

    • Achieved significant improvement in compressed pulse quality with a smoother broadened spectrum.
    • Compressed laser pulses from an initial duration of 205 fs down to 32 fs.
    • Retained over 96% of the pulse energy within the main temporal feature, indicating high pulse quality.

    Conclusions:

    • The dispersion-engineered multipass cell effectively enhances frequency chirping for improved pulse compression.
    • This work represents the first experimental demonstration of pulse quality improvement via enhanced frequency chirping in a multipass cell.
    • The results highlight the potential of dispersion-tailored multipass cells for advanced ultrashort pulse manipulation.