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Self-sustained pulsations in a quantum-dot laser.

E A Viktorov1, T Erneux2

  • 1National Research University of Information Technologies, Mechanics and Optics, Saint Petersburg, Russia and Optique Nonlinéaire Théorique, Campus Plaine, CP 231, 1050 Bruxelles, Belgium.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 11, 2014
PubMed
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This study explains low-frequency oscillations in quantum dot (QD) lasers using a delay differential equation. A homoclinic bifurcation from a cavity mode generates these pulsating oscillations, influenced by optothermal effects.

Area of Science:

  • Physics
  • Optics
  • Nonlinear Dynamics

Background:

  • Quantum dot (QD) lasers are crucial optoelectronic devices.
  • Understanding low-frequency oscillations (LFOs) in QD lasers is essential for their application.
  • This work addresses LFOs in QD lasers lacking saturable absorbers and exhibiting no relaxation oscillations.

Purpose of the Study:

  • To analyze the underlying mechanism of low-frequency oscillations in QD lasers.
  • To investigate the role of optothermal effects in pulsed dynamics.
  • To explain recent experimental observations of LFOs in QD lasers.

Main Methods:

  • Analysis of a delay differential equation for the electrical field amplitude.
  • Both analytical and numerical investigation of the laser dynamics.

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  • Identification of bifurcation mechanisms leading to pulsating oscillations.

    • Main Results:

    • A homoclinic bifurcation from a cavity mode is identified as the cause of LFOs.
    • The study demonstrates the existence of this bifurcation mechanism.
    • Optothermal effects are shown to play a significant role in shaping the pulsed dynamics.

    Conclusions:

    • The observed low-frequency pulsating oscillations in QD lasers are explained by a homoclinic bifurcation.
    • The theoretical model provides insight into the dynamics of specific QD laser systems.
    • Optothermal feedback is a key factor in the generation of pulsed laser output.