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Multimode semiconductor laser with selective optical feedback.

E A Viktorov1, P Mandel

  • 1Institute for Laser Physics, 199034 St. Petersburg, Russia.

Optics Letters
|December 11, 2007
PubMed
Summary
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This study explores chaos in multimode semiconductor lasers with optical feedback. Researchers found a period-doubling route to chaos and a heteroclinic connection linked to low-frequency fluctuations.

Area of Science:

  • Physics
  • Optics
  • Nonlinear Dynamics

Background:

  • Semiconductor lasers are crucial in modern technology.
  • Understanding laser dynamics under optical feedback is essential for device stability and performance.
  • Multimode lasers exhibit complex behaviors not seen in single-mode systems.

Purpose of the Study:

  • To investigate the complex dynamics of multimode semiconductor lasers subjected to moderate selective optical feedback.
  • To identify the routes to chaos and associated phenomena in such systems.
  • To explain experimentally observed low-frequency fluctuations through theoretical modeling.

Main Methods:

  • Theoretical analysis of a multimode semiconductor laser model.
  • Investigation of bifurcations, including Hopf bifurcations.

Related Experiment Videos

  • Identification of period-doubling routes to chaos.
  • Analysis of heteroclinic connections between unstable fixed points.

    • Main Results:

    • The steady state of the laser destabilizes via a Hopf bifurcation.
    • A period-doubling route to chaos was observed.
    • A heteroclinic connection between a saddle node and an unstable focus was identified.
    • This connection is associated with experimentally observed low-frequency fluctuations.
    • The heteroclinic connection coexists with a chaotic attractor.

    Conclusions:

    • The study elucidates the complex dynamics of multimode semiconductor lasers under optical feedback.
    • Period-doubling and heteroclinic connections are key mechanisms driving chaotic behavior and low-frequency fluctuations.
    • The findings provide a theoretical basis for understanding and potentially controlling laser instabilities.