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Efficient second-harmonic generation through cascaded optically poled fibers.

Wasyhun Asefa Gemechu, Umberto Minoni, Daniele Modotto

    Optics Letters
    |February 1, 2023
    PubMed
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    Researchers demonstrated efficient second-harmonic generation by splicing optically poled fiber segments. This novel method significantly boosts conversion efficiency compared to single fiber segments.

    Area of Science:

    • Nonlinear Optics
    • Fiber Optics
    • Photonics

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion.
    • Optically poled fibers offer a promising nonlinear medium.
    • Improving SHG efficiency in practical devices remains a challenge.

    Purpose of the Study:

    • To experimentally demonstrate efficient second-harmonic generation (SHG) using spliced optically poled fiber segments.
    • To investigate the impact of segment splicing on overall conversion efficiency.
    • To compare the performance of a multi-segment device against a single poled fiber.

    Main Methods:

    • Fabrication of optically poled fiber segments.
    • Splicing of multiple (five) 20 cm long poled fiber segments.

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  • Experimental measurement of second-harmonic generation conversion efficiency at various fundamental power levels.

    • Main Results:

    • A five-segment spliced fiber device achieved a 5.5-fold increase in conversion efficiency compared to a single segment.
    • Maximum conversion efficiency reached 5.4% at a fundamental average power of 4.2 mW.
    • The multi-segment device consistently outperformed a single fiber of equivalent total length.

    Conclusions:

    • Splicing optically poled fiber segments is an effective method for enhancing second-harmonic generation efficiency.
    • This segmented approach offers a scalable solution for efficient frequency conversion in fiber-based devices.
    • The demonstrated technique provides a practical pathway towards higher-performance photonic devices.