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Dual-periodically poled lithium niobate microcavities supporting multiple coupled parametric processes.

Li Zhang, Zhenzhong Hao, Qiang Luo

    Optics Letters
    |June 16, 2020
    PubMed
    Summary

    Researchers developed dual-period periodically poled lithium niobate (PPLN) microdisk cavities enabling multiple nonlinear optical processes. This platform achieves high conversion efficiency for second-harmonic generation, paving the way for cascaded parametric effects.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Photonics

    Background:

    • Periodically poled lithium niobate (PPLN) microcavities offer flexibility for nonlinear optical processes.
    • Achieving multiple coupled parametric processes requires advanced quasi-phase matching strategies.

    Purpose of the Study:

    • To demonstrate simultaneous multiple coupled parametric processes in dual-period PPLN microdisk cavities.
    • To investigate the potential for wavelength and polarization flexible nonlinear optical applications.

    Main Methods:

    • Fabrication of PPLN microdisks using CMOS-compatible techniques.
    • Electrical poling of PPLN microdisks utilizing piezoresponse force microscopy.
    • Characterization of microcavity quality factors and domain structures.

    Main Results:

    • Simultaneous realization of multiple coupled parametric processes due to increased reciprocal vectors.
    • Achieved high quality factors (up to 1.43×105) and small domain sizes (90 nm).
    • Measured a high second-harmonic generation conversion efficiency of 51%W-1.

    Conclusions:

    • Dual-period PPLN microdisk cavities are effective for multiple quasi-phase matched nonlinear processes.
    • This platform enables efficient cascaded parametric effects, including third- and fourth-harmonic generation.