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Numerical study of optical feedback coherence in semiconductor laser dynamics.

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    This study simulates semiconductor laser dynamics under varying optical feedback coherence. Results show partial coherence levels significantly impact laser behavior, crucial for experimental design.

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    Area of Science:

    • Nonlinear dynamics
    • Semiconductor lasers
    • Optical feedback systems

    Background:

    • Prior research contrasts coherent and incoherent delayed optical feedback in semiconductor lasers.
    • The impact of varying feedback coherence on laser dynamics remains an area for detailed investigation.

    Purpose of the Study:

    • To simulate and analyze the nonlinear dynamics of a semiconductor laser as optical feedback coherence is systematically varied.
    • To investigate the transition from coherent to incoherent feedback and its effect on laser behavior.

    Main Methods:

    • Simulations of an edge-emitting, 830 nm, Fabry-Perot semiconductor laser with a long external cavity.
    • Systematic variation of optical feedback coherence using an increasing rate of phase disturbance.

    Main Results:

    • The study demonstrates a clear dependence of semiconductor laser dynamics on the coherence of delayed optical feedback.
    • Dynamics transition progressively as coherence shifts from fully coherent to fully incoherent.

    Conclusions:

    • The level of partial coherence in delayed optical feedback is a critical parameter influencing semiconductor laser dynamics.
    • Future experimental studies should quantify the coherence level of optical feedback within the partial coherence continuum.