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    Researchers demonstrated concurrent phase-matchings for multi-wavelength conversion in coupled thin film lithium niobate waveguides. This breakthrough, achieved without poling, enables tunable on-chip nonlinear optical processes for nanophotonics and quantum optics applications.

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    Area of Science:

    • Integrated photonics
    • Nonlinear optics
    • Thin film lithium niobate

    Background:

    • Thin film lithium niobate (TFLN) is a key material for integrated photonics due to its strong second-order nonlinear properties.
    • Wavelength conversion is crucial for various photonic applications, but efficient on-chip methods are challenging.

    Purpose of the Study:

    • To demonstrate concurrent phase-matchings for multi-wavelength conversion in TFLN waveguides.
    • To achieve this without employing the conventional poling technique.
    • To explore the tunability of phase-matching conditions.

    Main Methods:

    • Utilized coupled dual waveguide structures in TFLN.
    • Employed modal phase-matching principles.
    • Investigated the impact of waveguide gap on phase-matching conditions for second harmonic generation.

    Main Results:

    • Successfully demonstrated concurrent phase-matchings for multi-wavelength conversion.
    • Validated three effective phase-matching conditions for second harmonic generation.
    • Showcased tunability of phase-matching wavelengths by adjusting the waveguide gap.

    Conclusions:

    • Coupled dual waveguide systems in TFLN offer a novel approach for on-chip nonlinear optics.
    • The demonstrated method is extendable to other nonlinear processes like difference frequency generation and spontaneous parametric down conversion.
    • This work advances efficient on-chip nonlinear optical processes for nanophotonics and quantum optics.