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Tailored second harmonic generation in Ti-diffused PPLN waveguides using micro-heaters.

Jonas Babai-Hemati, Felix Vom Bruch, Harald Herrmann

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    Summary
    This summary is machine-generated.

    Fabrication imperfections limit nonlinear optical frequency conversion efficiency in waveguides. A novel post-trimming method using micro-heaters successfully tailors spectral characteristics, enhancing efficiency in periodically poled lithium niobate devices.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Integrated Photonics

    Background:

    • Frequency conversion via nonlinear optical interactions is highly efficient in waveguide structures.
    • Fabrication imperfections in waveguides often limit conversion efficiency and distort spectral shapes.

    Purpose of the Study:

    • To demonstrate a post-trimming method to overcome fabrication imperfections in nonlinear optical waveguides.
    • To tailor the spectral characteristics of phase-matching curves for improved frequency conversion.

    Main Methods:

    • Utilizing a cascade of ten micro-heaters along the waveguide interaction length for post-fabrication trimming.
    • Investigating second harmonic generation in a titanium-indiffused waveguide in periodically poled lithium niobate (PPLN).

    Main Results:

    • Successfully demonstrated a post-trimming method to correct for fabrication imperfections.
    • Achieved tailoring of the spectral characteristics of phase-matching curves.
    • Showcased the effectiveness in a Ti-indiffused PPLN waveguide for second harmonic generation.

    Conclusions:

    • The micro-heater-based post-trimming method effectively compensates for fabrication imperfections in nonlinear optical waveguides.
    • This technique allows for precise control over spectral properties, leading to improved frequency conversion efficiency.
    • The demonstrated method offers a viable solution for enhancing the performance of integrated photonic devices for frequency conversion applications.