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Related Concept Videos

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

805
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
805

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High efficiency second harmonic generation in transverse orientation patterned gallium phosphide waveguides.

Antoine Lemoine, Brieg Le Corre, Lise Morice

    Optics Express
    |July 30, 2025
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    Summary
    This summary is machine-generated.

    This study demonstrates transverse orientation-patterned gallium phosphide (TOP-GaP) waveguides for efficient second harmonic generation in integrated photonics. This breakthrough unlocks modal phase matching for enhanced nonlinear optical processes.

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    Area of Science:

    • Integrated photonics
    • Nonlinear optics
    • Materials science

    Background:

    • High conversion efficiencies in second-order nonlinear optical processes are crucial for integrated photonics.
    • Achieving efficient second harmonic generation (SHG) in waveguides remains a significant challenge.

    Purpose of the Study:

    • To demonstrate the first transverse orientation-patterned gallium phosphide (TOP-GaP) waveguides for high-efficiency SHG.
    • To explore the potential of TOP-GaP in advancing nonlinear optical applications.

    Main Methods:

    • Fabrication of TOP-GaP waveguides.
    • Theoretical analysis of modal phase matching in TOP structures.
    • Linear and nonlinear characterization of the waveguides.

    Main Results:

    • Demonstration of high-efficiency second harmonic generation in TOP-GaP waveguides.
    • Successful implementation of first-order modal phase matching through vertical nonlinear susceptibility inversion.
    • Detailed characterization of waveguide performance.

    Conclusions:

    • TOP-GaP waveguides offer a promising platform for efficient nonlinear optical processes.
    • The presented approach enables optimized modal phase matching for enhanced SHG.
    • This work paves the way for advanced integrated photonic devices for classical and quantum applications.