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    Researchers demonstrate robust single-pulse generation from fiber Kerr resonators using stretched-pulse solitons, achieving 120-fs pulse durations. This breakthrough enhances ultrashort pulse generation for diverse applications.

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    Area of Science:

    • Nonlinear optics
    • Fiber optics
    • Ultrashort pulse generation

    Background:

    • Fiber Kerr resonators offer flexible wavelength and repetition rate for ultrashort pulse generation.
    • Existing fiber Kerr resonators often produce longer pulses and require complex single-pulse generation techniques.
    • Limitations hinder applications in telecommunications, biomedicine, and materials processing.

    Purpose of the Study:

    • To overcome limitations in fiber Kerr resonator pulse duration and single-pulse generation complexity.
    • To demonstrate robust single-pulse performance with ultrashort pulse durations.
    • To investigate the role of stretched-pulse solitons in achieving these goals.

    Main Methods:

    • Experimental and numerical studies of fiber Kerr resonators utilizing stretched-pulse solitons.
    • Optimization of total cavity length based on drive, Raman scattering, and pulse stretching.
    • Investigation of net dispersion effects on bandwidth and pulse duration.

    Main Results:

    • Demonstrated robust single-pulse performance with 120-fs pulse durations.
    • Identified strong dependence of stretched-pulse soliton performance on total cavity length.
    • Observed increased bandwidth with decreased net dispersion, enabled by shorter cavity lengths.
    • Achieved stable stretched-pulse solitons and soliton trapping with a pulsed drive source.

    Conclusions:

    • Stretched-pulse solitons enable robust 120-fs single-pulse generation in fiber Kerr resonators.
    • Optimized cavity length is crucial and depends on drive, Raman scattering, and pulse stretching.
    • This work represents a critical step toward practical femtosecond pulse generation for various applications.