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Experimental deterministic coherence resonance.

Jhon F Martinez Avila1, Hugo L D de S Cavalcante, J R Rios Leite

  • 1Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil.

Physical Review Letters
|November 5, 2004
PubMed
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Coherence resonance was observed in a chaotic diode laser system without external noise. Fast deterministic dynamics mimicked noise, narrowing resonance in laser power cycles.

Area of Science:

  • Nonlinear Dynamics
  • Laser Physics
  • Chaos Theory

Background:

  • Coherence resonance typically requires external noise to enhance signal coherence.
  • Previous studies focused on noise-induced or deterministic stochastic resonance.
  • Understanding resonance phenomena in autonomous systems is crucial.

Purpose of the Study:

  • To demonstrate coherence resonance in a dynamical system without external noise.
  • To investigate the role of deterministic dynamics in inducing resonance.
  • To extend the understanding of resonance phenomena in chaotic lasers.

Main Methods:

  • Experimental observation in low-frequency fluctuations of a chaotic diode laser with optical feedback.
  • Numerical verification using the Lang-Kobayashi equations for a single solitary mode laser.

Related Experiment Videos

  • Analysis of autonomous slow power drop cycles in the laser system.

    • Main Results:

    • Coherence resonance was successfully demonstrated in the absence of external noise.
    • Fast deterministic dynamics effectively acted as an exciting noise source.
    • The resonance was narrowed by the deterministic dynamics within the laser's power cycles.

    Conclusions:

    • Deterministic dynamics can induce coherence resonance in chaotic systems.
    • This finding extends the concepts of deterministic stochastic resonance and noise-induced coherence resonance.
    • The study highlights a new mechanism for coherence enhancement in autonomous laser systems.