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Vector rectangular-shape laser based on reduced graphene oxide interacting with a long fiber taper.

Lei Gao, Tao Zhu, Wei Huang

    Applied Optics
    |October 17, 2014
    PubMed
    Summary
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    Researchers developed a novel dual-wavelength fiber laser using reduced graphene oxide. This laser exhibits enhanced nonlinearity and fast polarization switching, paving the way for advanced optical applications.

    Area of Science:

    • Photonics and Laser Technology
    • Materials Science

    Background:

    • Nonlinear optics and saturable absorption are crucial for advanced laser design.
    • Reduced graphene oxide (rGO) offers unique optical properties for laser applications.

    Purpose of the Study:

    • To propose and investigate a novel vector dual-wavelength rectangular-shape laser (RSL) utilizing a reduced graphene oxide-coated fiber taper.
    • To enhance optical nonlinearity and saturable absorption properties in the laser system.

    Main Methods:

    • Fabrication of an 8 mm fiber taper with a 4 μm waist diameter, coated with reduced graphene oxide.
    • Utilizing the enhanced evanescent-field interaction and field confinement for high nonlinearity.
    • Characterization of the RSL's polarization switching, temporal, and spectral properties at a 7.9 MHz repetition rate.

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    Main Results:

    • The proposed RSL demonstrated dual-wavelength operation.
    • Enhanced nonlinearity and saturable absorption were achieved due to the rGO-coated fiber taper.
    • Fast polarization switching in orthogonal directions was observed.

    Conclusions:

    • The developed rGO-based fiber taper is effective in enhancing nonlinearity and saturable absorption for a dual-wavelength RSL.
    • The laser exhibits promising characteristics for polarization-dependent applications.
    • This work contributes to the development of advanced fiber laser systems.