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Oscillations In An LC Circuit01:30

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    This study introduces novel few-mode fiber lasers capable of self-starting high-order mode (HOM) oscillation in both continuous-wave and pulsed states. These lasers offer stable cylindrical vector beams with high purity, paving the way for advanced optical applications.

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    Area of Science:

    • Fiber Laser Technology
    • Photonics
    • Optical Engineering

    Background:

    • Achieving stable high-order mode (HOM) oscillation in fiber lasers is challenging.
    • Suppression of fundamental mode is crucial for pure HOM output.
    • Self-starting mode-locked operation in HOM is difficult to realize.

    Purpose of the Study:

    • To propose and demonstrate two types of few-mode fiber lasers with self-starting HOM oscillation.
    • To achieve stable continuous-wave (CW) and pulsed HOM operation.
    • To enable compact and robust HOM fiber laser systems.

    Main Methods:

    • Utilizing a bandpass filter with a few-mode fiber pigtail to suppress the fundamental mode.
    • Employing a saturable absorber to achieve self-starting mode-locked pulses.
    • Designing and fabricating all-few-mode fiber laser cavities.

    Main Results:

    • Demonstrated self-starting HOM oscillation in both CW and pulsed regimes.
    • Achieved high signal-to-noise ratio (up to 70 dB) in CW HOM operation.
    • Obtained slope efficiency up to 46% and stable pulsed operation at 1063.72 nm with high mode purity (>98%) cylindrical vector beams.
    • Confirmed the first demonstration of self-starting HOM direct oscillation in stable CW and pulsed states without additional adjustments.

    Conclusions:

    • Successfully developed compact and stable few-mode fiber lasers with self-starting HOM oscillation.
    • The demonstrated lasers deliver high-purity cylindrical vector beams, suitable for various applications.
    • This work provides a promising pathway for high-power fiber lasers with arbitrary HOMs stable output.