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All-fiber saturable absorber based on nonlinear multimode interference with enhanced modulation depth.

Teng Wang, Yongmin Jung, Peter Horak

    Applied Optics
    |October 8, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel fiber laser saturable absorber using nonlinear multimode interference (NL-MMI). This compact, high-damage threshold device enables stable mode-locked fiber laser operation.

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    Area of Science:

    • Photonics and Optics
    • Laser Physics

    Background:

    • Mode-locked fiber lasers are crucial for various applications.
    • Developing effective and robust saturable absorbers (SAs) is key to advancing laser technology.

    Purpose of the Study:

    • To demonstrate a passively mode-locked fiber ring laser.
    • To utilize a novel small-core fiber-graded index multimode fiber-single-mode fiber (SCF-GIMMF-SMF) structure as a saturable absorber.
    • To leverage the nonlinear multimode interference (NL-MMI) effect for laser operation.

    Main Methods:

    • Fabrication of a SCF-GIMMF-SMF structure for use as a saturable absorber.
    • Integration of the NL-MMI saturable absorber into a fiber ring laser cavity.
    • Experimental characterization of the laser's mode-locking performance.

    Main Results:

    • Stable fundamental mode-locked operation achieved.
    • Low pump threshold of 166 mW.
    • Generated soliton pulses with 647 fs duration at 1557.96 nm, 5.2 nm spectral width, and 19.37 MHz repetition rate.

    Conclusions:

    • The NL-MMI saturable absorber is effective for passively mode-locked fiber lasers.
    • The device offers advantages including high damage threshold, compact size, and simple fabrication.
    • Potential for application in high-power mode-locked fiber lasers.