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Mode selection in square resonator microlasers for widely tunable single mode lasing.

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    Researchers achieved tunable single-mode lasing in square resonator semiconductor microlasers. Adjusting output waveguide width effectively controlled laser modes, enabling continuous wavelength tuning without mode hopping.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Nanophotonics

    Background:

    • Square resonator microlasers offer unique optical properties.
    • Achieving single-mode operation and wavelength tunability is crucial for laser applications.
    • Mode hopping in lasers limits their performance and tunability.

    Purpose of the Study:

    • To demonstrate mode selection in square resonator semiconductor microlasers.
    • To achieve widely tunable single-mode lasing.
    • To efficiently avoid mode hopping in microlasers.

    Main Methods:

    • Simulations and experimental verification were employed.
    • Mode selection was achieved by adjusting the output waveguide width.
    • Lasing wavelength tuning was performed by varying the injection current.

    Main Results:

    • Widely tunable single-mode lasing was realized in square resonator microlasers.
    • Adjusting output waveguide width increased the mode interval significantly.
    • Mode-hopping-free operation with a 9.2 nm tuning range was achieved in a specific microlaser configuration.

    Conclusions:

    • The width of the output waveguide is a critical parameter for mode control in square microlasers.
    • Efficient mode selection and continuous wavelength tuning are achievable.
    • This method provides a pathway for developing advanced tunable semiconductor lasers.