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Tunable mode-locked Tm-doped fiber laser based upon cross-phase modulation.

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    We developed a tunable ultrafast thulium fiber laser using cross-phase modulation (XPM) for mode-locking. This method enables wavelength tuning without saturable absorbers, offering a dual-color laser system.

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    Area of Science:

    • Photonics and Laser Technology
    • Ultrafast Optics
    • Fiber Lasers

    Background:

    • Mode-locking is crucial for generating ultrashort optical pulses.
    • Thulium (Tm)-doped fiber lasers operate in the 2-µm wavelength range, important for various applications.
    • Traditional mode-locking often relies on saturable absorbers, which can limit performance.

    Purpose of the Study:

    • To demonstrate a novel mode-locking mechanism in a Tm-doped fiber laser.
    • To achieve wavelength tunability in ultrafast fiber lasers.
    • To develop a passively synchronized dual-color fiber laser system.

    Main Methods:

    • Utilized cross-phase modulation (XPM) induced by an injected 1.5-µm pulsed laser to mode-lock a 2-µm Tm-doped fiber laser.
    • Periodically modulated the 2-µm signal via XPM to achieve mode-locking without saturable absorbers.
    • Adjusted the repetition frequency of the 1.5-µm pulsed laser to tune the output wavelength.

    Main Results:

    • Successfully generated soliton and dissipative soliton modes in the Tm-doped fiber laser.
    • Achieved wavelength tuning ranges of 11 nm for soliton and 15 nm for dissipative soliton regimes.
    • Demonstrated wavelength tunability by controlling the repetition frequency of the injected pulsed laser.

    Conclusions:

    • The XPM-induced mode-locking mechanism provides a versatile method for ultrafast laser operation.
    • This technique allows for continuous and controllable wavelength tuning of Tm-doped fiber lasers.
    • The developed system offers a passively synchronized dual-color fiber laser, promising for applications in spectroscopy and nonlinear optics.