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Related Experiment Videos

Coherence resonance near a Hopf bifurcation.

O V Ushakov1, H-J Wünsche, F Henneberger

  • 1Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15 12489 Berlin, Germany. ushakov@physik.hu-berlin.de

Physical Review Letters
|October 4, 2005
PubMed
Summary

Coherence resonance was observed in semiconductor lasers near Hopf bifurcations. The study reveals how noise affects laser pulsations differently based on bifurcation type, impacting spectral properties and correlation times.

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Area of Science:

  • Nonlinear dynamics
  • Semiconductor laser physics
  • Optical engineering

Background:

  • Semiconductor lasers exhibit complex dynamics near bifurcations.
  • Optical feedback can induce self-pulsations and influence laser coherence.
  • Understanding noise effects is crucial for laser stability and performance.

Purpose of the Study:

  • To investigate coherence resonance in semiconductor lasers with short optical feedback.
  • To analyze the impact of noise on self-pulsations near Hopf bifurcations.
  • To differentiate coherence behavior between supercritical and subcritical bifurcations.

Main Methods:

  • Experimental observation of coherence resonance in a semiconductor laser system.
  • Analysis of power spectra to identify Lorentzian-like features.

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  • Theoretical modeling using a generic self-sustained oscillator model.

    • Main Results:

    • Distinct Lorentzian-like features in the power spectrum indicate noise-induced self-pulsations.
    • Coherence character depends on the bifurcation type (supercritical vs. subcritical).
    • Supercritical case: spectral width and peak height are monotonic with noise.
    • Subcritical case: spectral width shows a minimum, indicating resonance in correlation time.

    Conclusions:

    • Coherence resonance is a general phenomenon in self-sustained oscillators near bifurcations.
    • Noise intensity affects damping differently in subcritical and supercritical cases.
    • Findings provide insights into controlling laser dynamics and coherence through noise management.