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Optical Cherenkov radiation in overmoded microresonators.

Andrey B Matsko, Wei Liang, Anatoliy A Savchenkov

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    We observed an optical Cherenkov radiation analog in nonlinear microring resonators. This phenomenon, a dispersive wave, arises from disruptions in group velocity dispersion within Kerr frequency combs, impacting mode families.

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    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Photonics

    Background:

    • Kerr frequency combs are generated in nonlinear microring resonators.
    • Mode interactions and dispersion play crucial roles in comb formation.
    • Cherenkov radiation is a well-known phenomenon in electromagnetics.

    Purpose of the Study:

    • To investigate the observation of an optical analog of Cherenkov radiation.
    • To analyze its manifestation in nonlinear microring resonators with interacting mode families.
    • To understand the underlying mechanisms of dispersive wave generation and spectral features.

    Main Methods:

    • Utilizing a nonlinear microring resonator setup.
    • Generating Kerr frequency combs with equidistant mode families.
    • Analyzing the spectral envelope and mode interactions.
    • Investigating frequency-dependent group velocity dispersion disruptions.

    Main Results:

    • Observed an optical Cherenkov radiation analog (dispersive wave).
    • Dispersive waves were emitted into different mode families due to dispersion disruptions.
    • Dips in the comb spectrum correlated with power emission peaks in other mode families.
    • Combined spectra showed peaks resembling Cherenkov radiation, without dips.

    Conclusions:

    • The study demonstrates the observability of Cherenkov radiation analogs in specific resonator configurations.
    • Dispersive wave emission is linked to mode interactions and dispersion anomalies.
    • Accurate modeling of Kerr combs with mode anti-crossings requires considering multiple interacting mode families.