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Interaction-induced mode switching in steady-state microlasers.

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    This summary is machine-generated.

    Interaction-induced mode switching (IMS) demonstrates how a new laser mode can deactivate an existing one through cross-gain saturation. This phenomenon, observed in microdisk lasers, offers potential for all-optical switching applications.

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    Area of Science:

    • Photonics and Laser Physics
    • Optical Engineering
    • Quantum Optics

    Background:

    • Understanding laser mode dynamics is crucial for developing advanced optical devices.
    • Cross-gain saturation is a known nonlinear effect in semiconductor lasers.
    • Existing models do not fully capture the complex interactions leading to mode suppression.

    Purpose of the Study:

    • To investigate and demonstrate a novel phenomenon termed interaction-induced mode switching (IMS).
    • To establish an analytical criterion for predicting IMS in laser systems.
    • To explore the potential of IMS for all-optical switching applications.

    Main Methods:

    • Theoretical modeling of coupled laser modes considering cross-gain saturation.
    • Derivation of an analytical criterion for IMS based on interaction coefficients and thresholds.
    • Numerical simulations and verification using a two-dimensional microdisk laser model.
    • Analysis of IMS in coupled laser cavities with varying pump profiles.

    Main Results:

    • Demonstrated that strong modal interactions via cross-gain saturation can cause a new lasing mode to switch off an existing mode.
    • Developed a simple analytic criterion for IMS occurrence for fixed pump profiles.
    • Showed that varying the spatial pump profile can induce IMS even when it's not predicted for a fixed profile.
    • Confirmed that IMS involves distinct modes that retain their spatial and frequency characteristics.

    Conclusions:

    • Interaction-induced mode switching is a distinct phenomenon from dynamical mode switching or hopping, occurring in steady-state lasing.
    • The derived analytic criterion provides a valuable tool for designing and predicting IMS in laser systems.
    • IMS presents a promising mechanism for developing robust and flexible all-optical switching devices.