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Lasing with resonant feedback in weakly scattering random systems.

C Vanneste1, P Sebbah, H Cao

  • 1Laboratoire de Physique de la Matière Condensée, CNRS UMR 6622, Université de Nice-Sophia Antipolis, Parc Valrose, Nice Cedex 02, France. vanneste@unice.fr

Physical Review Letters
|May 16, 2007
PubMed
Summary
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Researchers explored laser action in active random media. They found resonant feedback originates from quasimodes, offering a new method to study non-Hermitian systems.

Area of Science:

  • Physics
  • Photonics
  • Quantum Optics

Background:

  • Investigating laser action in active random media is crucial for developing novel light sources.
  • Understanding feedback mechanisms in disordered systems is a key challenge in photonics.

Purpose of the Study:

  • To investigate laser action in active random media within the weak scattering regime.
  • To identify the origin of resonant feedback in the absence of Anderson localization.
  • To explore the relationship between lasing modes and quasimodes of passive systems.

Main Methods:

  • Coupling Maxwell's equations with the rate equations of a four-level atomic system.
  • Analyzing lasing modes in terms of traveling waves.
  • Identifying feedback mechanisms by examining quasimodes of the passive system.

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Main Results:

  • Systematic lasing action with resonant feedback was observed.
  • Lasing modes were predominantly traveling waves extending throughout the system.
  • Evidence suggests feedback originates from quasimodes of the passive system, not disorder-induced resonances.

Conclusions:

  • The study identifies quasimodes as the source of resonant feedback in active random media.
  • This work provides an original method for accessing the spatial distribution of quasimodes in non-Hermitian systems.
  • Findings contribute to the fundamental understanding of light propagation and lasing in disordered optical materials.