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Dynamics of semiconductor lasers with external multicavities.

Alexander Többens1, Ulrich Parlitz

  • 1Drittes Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.

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Adding external resonators to semiconductor lasers can control chaotic light fluctuations. Multiple resonators, especially three, enhance laser stability and ordered oscillations, leading to steady-state operation.

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Area of Science:

  • Nonlinear dynamics
  • Semiconductor laser physics
  • Optical engineering

Background:

  • Semiconductor lasers exhibit chaotic intensity fluctuations when subjected to weak optical feedback from an external resonator.
  • Controlling these chaotic dynamics is crucial for stable laser operation in various applications.

Purpose of the Study:

  • To investigate the effect of adding multiple external resonators on the dynamics of a semiconductor laser.
  • To determine if multicavity systems can stabilize chaotic oscillations and improve continuous-wave operation.

Main Methods:

  • Experimental setup involving a semiconductor laser with one, two, or three external resonators.
  • Numerical simulations using an extended Lang-Kobayashi model.
  • Linear stability analysis of continuous-wave solutions.

Main Results:

  • A single external resonator induces high-dimensional chaotic fluctuations in laser intensity.
  • Adding a second resonator with a different round-trip time can lead to more ordered oscillations or stable steady states.
  • A third resonator further increases the stability range of periodic or continuous-wave solutions.

Conclusions:

  • Multicavity external resonators offer a method to control and stabilize chaotic semiconductor laser dynamics.
  • The number and properties of the resonators significantly influence the transition from chaos to order.
  • This research provides a pathway for designing more stable and predictable semiconductor laser systems.