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    Area of Science:

    • Nonlinear Optics
    • Integrated Photonics
    • Fiber Optics

    Background:

    • Second Harmonic Generation (SHG) is crucial for frequency conversion.
    • Traditional SHG setups use bulky free-space optics, posing alignment challenges.
    • There is a need for compact and efficient SHG systems.

    Purpose of the Study:

    • To demonstrate the application of fiber optic microlenses for ultrafast SHG.
    • To develop a compact, fiber-integrated solution for SHG.
    • To compare the performance of microlens-based SHG with bulk optics setups.

    Main Methods:

    • Fabrication of fiber optic microlenses using a three-electrode arc discharge in a large-diameter splicing system.
    • Utilizing a 1560 nm femtosecond laser source for SHG experiments.
    • Comparative analysis of bulk optics and microlens-based setups, measuring SHG power, spectrum, and pulse duration.

    Main Results:

    • The microlens configuration significantly reduced system complexity.
    • Achieved higher conversion efficiency with a maximum SHG power of 65.3 mW.
    • Demonstrated a maximum SHG efficiency of 49.7%, outperforming the bulk optics setup.

    Conclusions:

    • Fiber optic microlenses provide a viable and efficient alternative for ultrafast SHG.
    • Integrated fiber microlens systems simplify alignment and enhance performance in nonlinear optical applications.
    • This technology paves the way for more compact and robust SHG devices.