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Frequency combs in a microring optical parametric oscillator.

A Villois, N Kondratiev, I Breunig

    Optics Letters
    |September 14, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate soliton frequency comb generation in microring resonators using both second-order (χ(2)) and Kerr nonlinearities. A critical power transition is identified, distinguishing low-pump from high-pump comb regimes.

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    Area of Science:

    • Nonlinear optics
    • Photonics
    • Materials science

    Background:

    • Soliton frequency combs are crucial for precision measurement and spectroscopy.
    • Microring optical parametric oscillators (OPOs) offer compact platforms for comb generation.
    • Simultaneous nonlinearities (χ(2) and Kerr) in resonators present complex dynamics.

    Purpose of the Study:

    • To investigate soliton frequency comb generation in microring OPOs.
    • To explore the interplay between χ(2) and Kerr nonlinearities.
    • To identify power-dependent transitions in comb characteristics.

    Main Methods:

    • Utilizing a bulk lithium niobate (LiNbO3) toroidal resonator.
    • Operating the OPO in the down-conversion regime.
    • Analyzing comb generation under varying pump powers.

    Main Results:

    • Successfully generated soliton frequency combs.
    • Observed normal group velocity dispersion between pump and signal.
    • Identified a critical pump power threshold.
    • Characterized a transition from χ(2)-dominated to a mixed χ(2)-Kerr nonlinearity regime.

    Conclusions:

    • The study elucidates the dual-nonlinearity dynamics in microring OPOs for comb generation.
    • A critical power transition dictates comb properties, enabling control over comb characteristics.
    • This work advances the understanding and design of compact frequency comb sources.