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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Supermode-based second harmonic generation in a nonlinear interferometer.

David Barral, Virginia D'Auria, Florent Doutre

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    Summary
    This summary is machine-generated.

    We demonstrate supermode-based second harmonic generation using an integrated nonlinear interferometer. This method allows precise control over light modes for advanced photonic applications.

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    Area of Science:

    • Photonics
    • Nonlinear Optics
    • Integrated Optics

    Background:

    • Integrated nonlinear optics enables advanced light manipulation.
    • Second harmonic generation (SHG) is crucial for frequency conversion.
    • Supermode excitation offers novel control over light propagation.

    Purpose of the Study:

    • To demonstrate supermode-based second harmonic generation (SHG) in an integrated nonlinear interferometer.
    • To control SHG spectral profiles by selecting fundamental spatial modes.
    • To explore modal phase matching for enhanced photonic circuit applications.

    Main Methods:

    • Utilizing an integrated nonlinear interferometer with linear and nonlinear directional couplers.
    • Employing a fully-fibered pump shaper for mode-selective SHG.
    • Implementing robust phase setting schemes (post-selection or active setting) for pumping mode control.

    Main Results:

    • Successful demonstration of supermode-based SHG.
    • Selection of symmetric or anti-symmetric fundamental spatial modes for pumping.
    • Control over SHG spectral profiles via fundamental wavelength and phase setting.

    Conclusions:

    • Modal phase matching in coupled nonlinear photonic circuits is feasible.
    • This technique enables multiplexing and scaling for classical and quantum applications.
    • Opens pathways for advanced light-processing using multimode excitation, encoding, and detection.