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    Area of Science:

    • Ultrafast optics
    • Nonlinear optics
    • Laser physics

    Background:

    • Sub-picosecond pulse compression is crucial for various scientific applications.
    • Existing methods like hollow-core fiber compression have limitations.
    • Optical parametric amplifiers (OPAs) are another established technique.

    Purpose of the Study:

    • To present an efficient and effective method for compressing sub-picosecond laser pulses.
    • To explore the use of a multipass cell with different gases for spectral broadening and pulse compression.
    • To offer a viable alternative to current pulse compression technologies.

    Main Methods:

    • Utilizing a multipass cell filled with nonlinear gases (neon, argon, nitrogen).
    • Subjecting sub-picosecond pulses (210 fs, 2 mJ, 200 W average power) to spectral broadening.
    • Compressing the spectrally broadened pulses.

    Main Results:

    • Achieved spectral broadening by over a factor of five.
    • Compressed pulses down to 37 fs with 35 GW peak power.
    • Maintained high power throughput (>93%) and good beam quality (1.3x1.5).

    Conclusions:

    • The multipass cell gas-filled compression method is highly efficient.
    • This technique provides a competitive alternative to hollow-core fiber compression and OPAs.
    • The demonstrated method offers high peak power and excellent beam quality.