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Third harmonic generation in exposed-core microstructured optical fibers.

Stephen C Warren-Smith, Jingxuan Wie, Mario Chemnitz

    Optics Express
    |August 10, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Researchers demonstrated efficient third harmonic generation in a novel exposed-core microstructured optical fiber. This breakthrough enables tunable visible light sources by leveraging the fiber

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    Area of Science:

    • Photonics and Optical Engineering
    • Nonlinear Optics
    • Materials Science

    Background:

    • Microstructured optical fibers (MOFs) offer unique light-matter interaction properties.
    • Third harmonic generation (THG) is a key nonlinear optical process for frequency conversion.
    • Controlling phase-matching in THG is crucial for efficient light generation.

    Purpose of the Study:

    • To demonstrate inter-modal phase-matched third harmonic generation (THG) in an exposed-core MOF.
    • To investigate the efficiency and spectral characteristics of THG in the visible range.
    • To explore the potential for tunable visible light sources using this fiber platform.

    Main Methods:

    • Fabrication of an exposed-core MOF with a 1.85 µm partially open core.
    • Experimental setup for inter-modal THG in the visible spectrum (500-530 nm).
    • Mode imaging and numerical simulations to confirm phase-matching and polarization effects.

    Main Results:

    • Efficient multi-peak THG achieved between 500 nm and 530 nm.
    • Maximum visible-wavelength output power of 0.96 μW recorded.
    • Strong agreement between experimental mode images/simulations and theoretical predictions.

    Conclusions:

    • The exposed-core MOF enables efficient inter-modal phase-matched THG.
    • The fiber design facilitates tailorable and tunable visible light generation.
    • Future work includes modifying the fiber core (e.g., thin-film coatings) to tune phase-matching conditions.