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Related Concept Videos

Carrier Generation and Recombination01:22

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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.
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Surface-emitting second-harmonic generation in a semiconductor vertical resonator.

R Lodenkamper, M L Bortz, M M Fejer

    Optics Letters
    |October 16, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers achieved a 240-fold efficiency boost in a surface-emitting second-harmonic generation device by using a monolithic vertical resonant cavity. This advancement paves the way for highly efficient semiconductor light emitters.

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    Area of Science:

    • Optoelectronics
    • Nonlinear Optics
    • Semiconductor Devices

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
    • Surface-emitting devices offer advantages in integration and beam quality.
    • Previous SHG devices faced limitations in efficiency and scalability.

    Purpose of the Study:

    • To enhance the efficiency of AlGaAs/AlAs surface-emitting SHG devices.
    • To explore the impact of resonant cavities on SHG performance.
    • To enable efficient generation of visible light (green/blue) from semiconductor sources.

    Main Methods:

    • Fabrication of an AlGaAs/AlAs waveguide core.
    • Integration of the waveguide within a monolithic vertical resonant cavity.
    • Experimental characterization of the SHG efficiency.

    Main Results:

    • Demonstrated a 240-fold increase in SHG device efficiency.
    • Achieved efficient surface emission of second-harmonic light.
    • Experimental validation of the resonant cavity enhancement.

    Conclusions:

    • Monolithic vertical resonant cavities significantly boost SHG efficiency in semiconductor devices.
    • Optimized devices show potential for several percent per watt conversion efficiency.
    • This work advances the development of compact and efficient visible light sources.