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Waveguide resonator with an integrated phase modulator for second harmonic generation.

M Stefszky, M Santandrea, F Vom Bruch

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    This summary is machine-generated.

    We demonstrate stable second harmonic generation using a lithium niobate waveguide resonator. This integrated photonics device shows potential for scalable optical networks, maintaining performance for over five minutes.

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    Area of Science:

    • Nonlinear optics
    • Integrated photonics
    • Materials science

    Background:

    • Lithium niobate (LiNbO3) is a key material for integrated photonics due to its nonlinear and electro-optic properties.
    • Waveguide resonators offer enhanced light-matter interaction for nonlinear processes like second harmonic generation (SHG).
    • Stabilizing cavity length is crucial for efficient and sustained nonlinear frequency conversion in integrated devices.

    Purpose of the Study:

    • To demonstrate stable second harmonic generation (SHG) from a titanium-indiffused lithium niobate waveguide resonator.
    • To investigate the long-term stability of the SHG process by locking the cavity length to the pump laser.
    • To assess the suitability of this platform for scalable integrated photonic networks.

    Main Methods:

    • Fabrication of a titanium-indiffused lithium niobate waveguide resonator.
    • Implementation of an on-chip phase modulator for active cavity length locking to the fundamental pump laser.
    • Characterization of second harmonic power stability over time.

    Main Results:

    • Achieved stable second harmonic generation with the cavity length locked for over 5 minutes.
    • Maintained more than 80% of the initial second harmonic power during the locking period.
    • Identified DC-drift in the lithium niobate system with deposited electrodes as the primary limitation to stability.

    Conclusions:

    • Waveguide resonators on lithium niobate are suitable for stable nonlinear frequency conversion.
    • Active cavity length locking demonstrates the potential for robust integrated photonic devices.
    • Addressing DC-drift is essential for realizing the full capabilities of these devices in larger networks.