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    Area of Science:

    • * Physics, Optics, Quantum Electronics

    Background:

    • * Optimal enhancement of broadband optical pulses in passive resonators depends on the seeding pulse train's carrier-envelope-offset frequency.
    • * Achieving high average powers from short optical pulses is essential for advanced applications like attosecond pulse generation.

    Purpose of the Study:

    • * To demonstrate control over the carrier-envelope-offset frequency by tuning the phase of cavity mirrors.
    • * To enable optimal enhancement of optical pulse trains for high-power applications.

    Main Methods:

    • * Controlled the phase of cavity mirrors to precisely tune the carrier-envelope-offset frequency.
    • * Utilized a seeding pulse train with zero carrier-envelope-offset frequency.

    Main Results:

    • * Achieved multi-kW average powers for sub-30-femtosecond (fs) optical pulses with zero phase slip.
    • * Demonstrated the enhancement of pulse trains generated by difference-frequency mixing.

    Conclusions:

    • * Controlling cavity mirror phase is a key method for optimizing optical pulse enhancement.
    • * This technique is vital for generating attosecond pulses at high repetition rates and for mid-infrared spectroscopy applications.