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Stabilizing continuous-wave output in semiconductor lasers by time-delayed feedback.

Thomas Dahms1, Philipp Hövel, Eckehard Schöll

  • 1Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

Multiple time-delayed feedback stabilizes semiconductor lasers, suppressing intensity pulsations for continuous-wave operation. This method offers control over laser dynamics, even with multistable behavior, by adjusting feedback parameters.

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Area of Science:

  • Laser Physics
  • Nonlinear Dynamics
  • Optical Engineering

Background:

  • Semiconductor lasers are prone to intensity pulsations, hindering stable operation.
  • Controlling laser dynamics is crucial for various photonic applications.

Purpose of the Study:

  • To investigate the stabilization of steady states in a modified Lang-Kobayashi semiconductor laser model.
  • To explore the use of multiple time-delayed feedback for controlling laser output.

Main Methods:

  • Utilized a modified Lang-Kobayashi model incorporating a Fabry-Perot resonator for optical feedback.
  • Calculated control domains based on feedback strength, delay time, memory parameter, latency, phase, and filtering.

Main Results:

  • Demonstrated that multiple time-delayed feedback suppresses unwanted intensity pulsations, achieving stable continuous-wave operation.
  • Identified control domains influenced by feedback parameters.
  • Observed multistable behavior and delay-induced pulsations for specific parameter choices.

Conclusions:

  • Multiple time-delayed feedback is an effective technique for stabilizing semiconductor lasers.
  • Careful selection of control parameters is necessary to achieve desired laser operation and avoid multistability.
  • Ramping injection current during turn-on can still achieve control in complex scenarios.