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Frequency comb generation in a quadratic nonlinear waveguide resonator.

Rikizo Ikuta, Motoki Asano, Ryoya Tani

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    Summary
    This summary is machine-generated.

    Researchers demonstrate an on-chip optical frequency comb (OFC) using quadratic nonlinearity in a waveguide resonator. This new device allows control over comb spectra separation, paving the way for integrated quantum technologies.

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    Area of Science:

    • Nonlinear optics
    • Integrated photonics
    • Quantum information science

    Background:

    • Microresonator-based optical frequency combs (OFCs) typically rely on third-order nonlinearity.
    • Quadratic-nonlinearity-based OFCs have been demonstrated in external cavity configurations.
    • On-chip implementation of quadratic-nonlinearity-based OFCs is highly desired for practical applications.

    Purpose of the Study:

    • To demonstrate the first on-chip optical frequency comb (OFC) utilizing quadratic nonlinearity.
    • To investigate the control of comb spectra separation in such a device.
    • To explore the potential of on-chip quadratic nonlinear devices for metrology and quantum information technologies.

    Main Methods:

    • Fabrication of an on-chip waveguide resonator with quadratic nonlinear material.
    • Generation of an optical frequency comb using two pump lights.
    • Characterization of the generated comb spectra and analysis of spectral separation control.

    Main Results:

    • Successfully demonstrated an on-chip OFC based on quadratic nonlinearity.
    • Achieved control over the comb spectra separation by tuning the frequency difference of the two pump lights.
    • Validated the feasibility of integrated quadratic nonlinear photonics for advanced applications.

    Conclusions:

    • The developed on-chip quadratic nonlinear waveguide resonator is a significant advancement for integrated photonics.
    • This technology offers a new platform for generating and controlling optical frequency combs on-chip.
    • The device holds promise for future applications in metrology and integrated quantum information processing.