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Optically injected lasers: the transition from class B to class A lasers.

B Kelleher1, S P Hegarty, G Huyet

  • 1Centre for Advanced Photonics and Process Analysis, Cork Institute of Technology, Cork, Ireland.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 2, 2013
PubMed
Summary

Investigating optically injected lasers reveals that phase-locked bistability and chaos phenomena emerge at low pump currents, irrespective of photon and carrier lifetime ratios. This finding simplifies understanding laser dynamics.

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Area of Science:

  • Optics and Photonics
  • Nonlinear Dynamics
  • Laser Physics

Background:

  • Optically injected lasers exhibit complex dynamics.
  • Laser stability diagrams are crucial for understanding device behavior.
  • The ratio of photon to carrier lifetime influences laser stability.

Purpose of the Study:

  • To analyze how varying the photon lifetime to carrier lifetime ratio affects laser stability diagrams.
  • To identify changes in phase-locked bistability and bifurcation points.
  • To investigate the emergence of chaos under different lifetime ratios and pump currents.

Main Methods:

  • Numerical simulations of an optically injected single mode laser.
  • Systematic variation of the photon lifetime to carrier lifetime ratio.

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  • Analysis of stability diagrams, bifurcation points, and chaotic behavior.

    • Main Results:

    • Increased photon to carrier lifetime ratios lead to distinct changes in the stability diagram.
    • Codimension-2 bifurcation points exhibit altered characteristics.
    • Phase-locked bistability regions and chaotic dynamics can appear at low pump currents, independent of the lifetime ratio.

    Conclusions:

    • Laser dynamics, including bistability and chaos, are not solely dependent on the photon to carrier lifetime ratio.
    • Low pump currents can induce complex behaviors typically seen at high lifetime ratios.
    • These findings offer a simplified perspective on controlling dynamics in optically injected lasers.