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Localized structures formed through domain wall locking in cavity-enhanced second-harmonic generation.

C Mas Arabí, P Parra-Rivas, T Hansson

    Optics Letters
    |October 15, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Localized structures in cavity-enhanced second-harmonic generation arise from domain walls. Temporal walk-off impacts the stability and dynamics of these unique optical states.

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    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Laser physics

    Background:

    • Cavity-enhanced second-harmonic generation (SHG) is a key process for frequency conversion.
    • Understanding localized structures is crucial for controlling nonlinear optical phenomena.
    • Previous studies often focused on different dispersion regimes or approximations.

    Purpose of the Study:

    • To analyze the formation mechanisms of localized structures in cavity-enhanced SHG.
    • To investigate the role of group velocity dispersion (GVD) and temporal walk-off.
    • To characterize the dynamics and stability of these nonlinear optical states.

    Main Methods:

    • Theoretical analysis in the phase-matched limit.
    • Consideration of opposite group velocity dispersion signs for fundamental and generated waves.
    • Investigation of domain wall locking and collapsed snaking dynamics.
    • Numerical simulations to study the impact of temporal walk-off.

    Main Results:

    • Localized structures form due to the locking of domain walls between stable homogeneous states.
    • These structures exhibit collapsed snaking behavior.
    • Temporal walk-off significantly influences the stability and dynamics of the localized states.
    • The interplay between dispersion and nonlinearity dictates structure formation.

    Conclusions:

    • Domain wall locking provides a novel mechanism for localized state formation in nonlinear cavities.
    • Collapsed snaking is a characteristic dynamics of these structures.
    • Temporal walk-off is a critical parameter for controlling and stabilizing localized states in practical devices.
    • This work offers insights into the fundamental physics of nonlinear light propagation and localization.