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Related Experiment Videos

Efficient second harmonic generation in low-loss planar GaN waveguides.

Maksym Gromovyi, Julien Brault, Aimeric Courville

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    We achieved low propagation losses in Gallium Nitride/Aluminum Gallium Nitride (GaN/AlGaN) waveguides, enabling efficient second harmonic generation. A novel polarity inversion method promises significantly higher conversion efficiencies for nonlinear optics applications.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nonlinear Optics

    Background:

    • Gallium Nitride (GaN) and Aluminum Gallium Nitride (AlGaN) alloys are crucial for optoelectronic devices.
    • Achieving low propagation losses in planar waveguides is essential for efficient nonlinear optical processes.

    Purpose of the Study:

    • To demonstrate low-loss GaN/AlGaN planar waveguides.
    • To achieve efficient second harmonic generation (SHG) using these waveguides.
    • To explore broadband nonlinear optical properties and propose improved SHG schemes.

    Main Methods:

    • Molecular beam epitaxy (MBE) growth of GaN/AlGaN on sapphire.
    • Fabrication of planar waveguides with optimized AlGaN cladding and reduced surface roughness.
    • Modal phase matching (MPM) for second harmonic generation.

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  • Theoretical modeling of broadband tunability and modal overlaps.

    • Main Results:

    • Demonstrated propagation losses below 1 dB/cm at 633 nm.
    • Achieved a maximal power conversion efficiency of 2% for SHG at 630 nm.
    • Showcased wavelength tunability of SHG from visible to near-infrared.
    • Proposed a novel planar polarity inversion technique to enhance modal overlaps.

    Conclusions:

    • Low-loss GaN/AlGaN waveguides are viable for efficient nonlinear optics.
    • The proposed polarity inversion method offers a pathway to significantly higher SHG conversion efficiencies.
    • The GaN/AlGaN platform exhibits broadband nonlinear characteristics suitable for tunable light generation.