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Optically induced hysteresis in a two-state quantum dot laser.

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    |March 15, 2016
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    Optical injection into quantum dot lasers can induce bistability between ground and excited state lasing. This phenomenon, driven by inhomogeneous broadening, results in a hysteresis loop in the laser output.

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    Area of Science:

    • Semiconductor physics
    • Optoelectronics
    • Quantum dot devices

    Background:

    • Quantum dot (QD) lasers exhibit complex lasing behaviors, including ground state only, excited state only, or simultaneous lasing.
    • Understanding and controlling these lasing modes is crucial for advanced photonic applications.

    Purpose of the Study:

    • To investigate the effect of optical injection near the ground state on QD lasers operating in excited state lasing mode.
    • To demonstrate and analyze the resulting injection-induced bistability and hysteresis in lasing output.

    Main Methods:

    • Experimental optical injection measurements on quantum dot lasers.
    • Numerical simulations to model the laser dynamics.
    • Analysis of lasing output spectra and power characteristics.

    Main Results:

    • Optical injection induces bistability between ground state and excited state dominated emission.
    • A distinct hysteresis loop is observed in the lasing output power.
    • Experimental results and numerical simulations show excellent agreement.

    Conclusions:

    • Inhomogeneous broadening is identified as the primary physical mechanism responsible for the observed injection-induced bistability.
    • Optical injection offers a method to control and switch between different lasing states in quantum dot lasers.
    • The findings provide insights into the fundamental physics governing QD laser operation.