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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Optical frequency shifters based on cascaded second-order nonlinear processes.

O Gorbounova, Y J Ding, J B Khurgin

    Optics Letters
    |October 31, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new optical frequency shifter using cascaded nonlinearities in semiconductors. This device offers efficient frequency conversion over a wide bandwidth with significantly reduced power requirements when using an in-plane cavity.

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    Area of Science:

    • Photonics
    • Nonlinear Optics
    • Semiconductor Devices

    Background:

    • Optical frequency shifters are crucial for various photonic applications.
    • Cascaded second-order nonlinearity (CSHG) offers a pathway for efficient nonlinear optical processes.

    Purpose of the Study:

    • To propose and analyze a novel optical frequency shifter design.
    • To investigate the performance of the proposed device in terms of conversion efficiency and bandwidth.

    Main Methods:

    • Utilizing cascaded second-order nonlinearity (CSHG) in a semiconductor material.
    • Implementing a coupled waveguide-to-vertical-cavity structure.
    • Analyzing sum-frequency and difference-frequency interactions.

    Main Results:

    • Achieved efficient frequency conversion over a 39 nm bandwidth in a 50-microm planar waveguide at 3.3 W/microm pump power density.
    • Demonstrated a significant reduction in required pump power density to 6 mW/microm with an in-plane cavity, enabling 20 nm effective conversion bandwidth.

    Conclusions:

    • The proposed optical frequency shifter design based on CSHG is highly efficient and versatile.
    • The integration of a longitudinal in-plane cavity dramatically lowers operational power requirements, making the device more practical.