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Three-dimensional graphene based passively mode-locked fiber laser.

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    This study introduces a novel fiber laser using three-dimensional (3D) graphene as a saturable absorber (SA). This 3D graphene SA effectively generates high-quality, stable mode-locked pulses for laser applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Saturable absorbers (SAs) are crucial for generating ultrashort pulses in mode-locked lasers.
    • Graphene, with its unique optical properties, has shown promise as an SA material.
    • Developing cost-effective and high-performance SAs remains an active area of research.

    Purpose of the Study:

    • To develop and demonstrate a novel all-fiber passively mode-locked fiber laser.
    • To investigate the efficacy of three-dimensional (3D) graphene as a saturable absorber (SA) in such lasers.
    • To explore a simple fabrication method for 3D graphene-based SAs.

    Main Methods:

    • Synthesized 3D graphene using template-directed chemical vapor deposition (CVD).
    • Fabricated a saturable absorber by sandwiching freestanding 3D graphene between fiber connectors.
    • Constructed an all-fiber passively mode-locked fiber laser incorporating the 3D graphene SA.

    Main Results:

    • The 3D graphene-based SA successfully generated high-quality mode-locked pulses.
    • Stable output pulses with a ~9.9 MHz repetition rate and ~1 ps pulse width were achieved.
    • The laser system delivered an average output power of ~10.5 mW in the single pulse region.

    Conclusions:

    • Freestanding 3D graphene is an effective saturable absorption material for passively mode-locked lasers.
    • The developed fabrication method offers a simple and efficient way to create graphene-based SAs.
    • This work paves the way for advanced fiber laser systems utilizing 3D graphene.