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Two-state lasing in a quantum dot racetrack microlaser.

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    |June 30, 2023
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    Summary
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    Racetrack microlasers exhibit unique two-state lasing, utilizing ground and second excited states in InAs/GaAs quantum dots. This results in a wider spectral separation of over 150 nm compared to other laser types.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Physics
    • Quantum Dot Technology

    Background:

    • Two-state lasing is crucial for advanced laser applications.
    • Quantum dot lasers offer tunable emission properties.
    • Racetrack microlasers present a unique cavity design.

    Purpose of the Study:

    • Investigate two-state lasing peculiarities in racetrack microlasers.
    • Analyze the role of InAs/GaAs quantum dots in lasing behavior.
    • Compare racetrack microlaser performance with edge-emitting and microdisk lasers.

    Main Methods:

    • Electroluminescence spectra measurements.
    • Variable injection current analysis.
    • Temperature-dependent characterization.

    Main Results:

    • Observed lasing via ground and second excited states in racetrack microlasers.
    • Achieved spectral separation exceeding 150 nm between lasing bands.
    • Determined temperature dependence of threshold currents for both lasing states.

    Conclusions:

    • Racetrack microlasers demonstrate distinct two-state lasing mechanisms.
    • The ground and second excited state lasing broadens spectral output.
    • Understanding temperature effects is key for racetrack microlaser design.