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Coherence enhanced intermittency in an optically injected semiconductor laser.

A Campos-Mejía, A N Pisarchik, R Sevilla-Escoboza

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    Summary
    This summary is machine-generated.

    We observed enhanced coherence in semiconductor laser intermittency. Regular switching between locked and unlocked states was found at specific pump currents, quantified by inter-spike interval fluctuations.

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    Area of Science:

    • Physics
    • Optics
    • Nonlinear Dynamics

    Background:

    • Semiconductor lasers exhibit noise-induced intermittency.
    • Optical injection can alter laser dynamics, including intermittency.
    • Understanding intermittency is crucial for laser applications.

    Purpose of the Study:

    • To experimentally observe coherence enhancement of noise-induced intermittency.
    • To investigate the effect of optical injection on laser intermittency.
    • To quantitatively characterize intermittent behavior in a semiconductor laser.

    Main Methods:

    • Experimental setup involving a semiconductor laser subject to optical injection.
    • Varying the injecting laser pump current to explore the frequency-locking regime boundary.
    • Analyzing inter-spike interval fluctuations using probability distribution shapes.

    Main Results:

    • Coherence enhancement of noise-induced intermittency was experimentally observed.
    • Intermittent switches between locked and unlocked states occurred more regularly at a specific pump current.
    • The shape of the probability distribution of inter-spike-interval fluctuations quantitatively characterized the intermittent behavior.

    Conclusions:

    • Optical injection can enhance the coherence of noise-induced intermittency in semiconductor lasers.
    • A specific pump current value leads to more regular switching dynamics.
    • Inter-spike interval distribution analysis provides a quantitative measure of intermittency.