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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
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Harmonic Nanoparticles for Regenerative Research
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Second-harmonic generation in AlGaAs-on-insulator waveguides.

Stuart May, Michael Kues, Matteo Clerici

    Optics Letters
    |March 16, 2019
    PubMed
    Summary

    Second-harmonic generation was achieved in aluminum gallium arsenide-on-insulator waveguides. This demonstrates a highly efficient material platform for developing advanced chip-scale photonic devices.

    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Nonlinear optics

    Background:

    • Second-harmonic generation (SHG) is a key nonlinear optical process.
    • AlGaAs-on-insulator (AOI) offers a promising platform for integrated photonics due to its high nonlinearities.

    Purpose of the Study:

    • To demonstrate efficient second-harmonic generation in AlGaAs-on-insulator waveguides.
    • To explore the potential of AOI for on-chip photonic applications at telecom wavelengths.

    Main Methods:

    • Fabrication of AlGaAs-on-insulator waveguides.
    • Characterization of nonlinear optical performance using pulsed laser excitation at telecom wavelengths.
    • Measurement of second-harmonic generation efficiency.

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    Main Results:

    • Demonstration of second-harmonic generation in AOI waveguides.
    • Achieved a maximum internal normalized efficiency of 1202±55% W⁻¹ cm⁻².
    • Utilized 100 fs pulsed excitation at 1560 nm.

    Conclusions:

    • AlGaAs-on-insulator is a viable material platform for efficient nonlinear optics.
    • The achieved efficiency paves the way for chip-scale photonic devices.
    • Potential applications include sensing, metrology, and quantum optics.