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Tunable single-mode lasing in a single semiconductor microrod.

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    Researchers developed a tunable single-mode microrod laser for optical communication. Wavelength modulation is achieved by simply adjusting the active region

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Nanophotonics

    Background:

    • Developing micro/nanoscale wire lasers with single-mode operation and wavelength modulation is crucial for applications like optical communication.
    • Existing methods often require complex manipulation or specific environmental conditions.

    Purpose of the Study:

    • To demonstrate the first tunable single-mode microrod laser without complex manipulation or environmental requirements.
    • To achieve wavelength modulation in a semiconductor microrod by controlling the active region's position.

    Main Methods:

    • Proposed a design using asymmetrical distributed Bragg reflectors (DBRs) in a Gallium Nitride (GaN) microrod.
    • Realized wavelength modulation by changing the axial location of the active region within the microrod.

    Main Results:

    • Achieved tunable single-mode lasing in a 45 μm GaN microrod.
    • Demonstrated flexible and repeatable wavelength modulation from 369.5 to 375.7 nm by altering the excitation source position.

    Conclusions:

    • This method offers a simple and direct approach to tunable single-mode lasing in microrod lasers.
    • The demonstrated technique has significant potential for applications in optical telecommunication and environmental monitoring.