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Grating integrated single mode microring laser.

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    Researchers developed a new method using second-order gratings to achieve single-mode lasing in microring lasers. This innovation enhances laser performance without significantly increasing the threshold current.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Device Physics

    Background:

    • Microring and microdisk lasers offer small footprints and low thresholds for integrated photonics.
    • However, they typically suffer from multimode lasing spectra and bistability, limiting their applications.

    Purpose of the Study:

    • To theoretically propose and experimentally demonstrate a novel approach for achieving single-mode lasing in microring lasers.
    • To address the limitations of multimode operation and bistability in current microring laser designs.

    Main Methods:

    • Integration of second-order gratings onto the microring waveguides.
    • Lithographic selection of lasing modes via the engineered grating structure.
    • Experimental demonstration using electrically pumped semiconductor microring lasers.

    Main Results:

    • Achieved single-mode lasing operation in microring lasers.
    • Demonstrated that the second-order gratings effectively increase radiation loss for unwanted modes.
    • Confirmed that the grating integration does not significantly increase the lasing threshold current.

    Conclusions:

    • The proposed method successfully enables single-mode operation in microring lasers.
    • Second-order gratings provide a viable strategy for mode selection and improved laser performance.
    • This technique is compatible with existing semiconductor fabrication processes and maintains low threshold characteristics.