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Updated: Dec 21, 2025

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All-optical thermal control for second-harmonic generation in an integrated microcavity.

Xin-Xin Hu, Jia-Qi Wang, Yuan-Hao Yang

    Optics Express
    |May 15, 2020
    PubMed
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    We demonstrate all-optical thermal control in microcavities for tunable second-harmonic (SH) generation. This method precisely tunes frequencies and overcomes thermal instability in photonic devices.

    Area of Science:

    • Photonics and Optical Engineering
    • Nonlinear Optics
    • Integrated Photonics

    Background:

    • Integrated microcavities offer strong light-matter interaction and stability for nonlinear optical effects.
    • Thermal instability caused by material absorption in pump lasers hinders practical applications of microcavities.

    Purpose of the Study:

    • To experimentally demonstrate all-optical control of thermal behavior in optical microcavities.
    • To achieve tunable doubly-resonant second-harmonic (SH) generation on an integrated photonic chip.
    • To overcome thermal resonance drift and lineshape distortion in microcavity-based nonlinear optics.

    Main Methods:

    • Utilized an auxiliary control laser to precisely adjust the temperature of a selected microring.
    • Investigated the thermo-optic effect and its impact on doubly-resonant second-harmonic generation.

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  • Developed a theoretical model applicable to various microcavity-enhanced nonlinear optical processes.

    • Main Results:

    • Achieved efficient, all-optical tuning of doubly-resonant wavelengths by controlling microcavity temperature.
    • Eliminated lineshape distortion caused by the thermo-optic effect.
    • Demonstrated a fast modulation rate up to 256 kHz, enabling quick reconfiguration.

    Conclusions:

    • All-optical thermal control provides a viable method for precise frequency tuning in microcavities.
    • The technique overcomes thermal instability issues, paving the way for practical applications.
    • The universal theoretical model supports broader applicability in microcavity-enhanced nonlinear optics.