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    Area of Science:

    • Optics and Photonics
    • Ultrafast Laser Science

    Background:

    • High-finesse femtosecond enhancement cavities (EC) are crucial for nonlinear optics and spectroscopy.
    • Increasing the spectral bandwidth of ECs is essential for advanced applications.

    Purpose of the Study:

    • To demonstrate a broad spectral bandwidth in a high-finesse femtosecond EC.
    • To enable efficient generation of ultrashort pulses for spectroscopic techniques.

    Main Methods:

    • Utilized a femtosecond enhancement cavity with an average finesse exceeding 300.
    • Achieved a broad spectrum spanning 1800 cm-1 around 1050 nm.

    Main Results:

    • Demonstrated a spectral bandwidth of 1800 cm-1 (195 nm) at -10 dB.
    • Showcased a circulating pulse composed of 5.4 optical cycles at kilowatt-level average power.

    Conclusions:

    • The enhanced bandwidth of the EC benefits transient absorption, frequency comb, and Raman spectroscopy.
    • This work paves the way for efficient generation of multi-megahertz-repetition-rate extreme ultraviolet attosecond pulses.