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Square wave excitability in quantum dot lasers under optical injection.

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    Quantum dot lasers exhibit unique square wave dynamics under high optical injection, challenging predicted bistability. Thermal effects are identified as the cause of this observed square wave phenomenon.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Quantum Dot Devices

    Background:

    • Quantum dot lasers exhibit complex dynamics when subjected to optical injection.
    • Theoretical predictions suggested bistability in quantum dot lasers at high injection strengths.

    Purpose of the Study:

    • To experimentally investigate the dynamic phenomena in optically injected quantum dot lasers.
    • To characterize the observed square wave behavior and its underlying mechanisms.

    Main Methods:

    • Optical injection experiments on quantum dot lasers.
    • Analysis of laser output dynamics, including periodic trains and noise-driven events.
    • Development and validation of a rate equation model.

    Main Results:

    • Observed square wave phenomena instead of predicted phase-locked bistability at high injection.
    • Square waves were found to manifest as periodic trains or noise-driven Type II excitable events.
    • Experimental evidence points to thermally induced breaking of bistability, with deterministic detuning evolution during squares.

    Conclusions:

    • The study reveals a novel square wave dynamic in quantum dot lasers, differing from theoretical bistability predictions.
    • Thermal effects play a crucial role in inducing this square wave behavior.
    • A validated rate equation model accurately describes the experimental observations.