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Time dependent theory for random lasers

Jiang1, Soukoulis

  • 1Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters
|September 16, 2000
PubMed
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This study introduces a random lasing model, revealing a critical pumping rate for lasing peaks. Mode repulsion causes saturation, linking localization length to mode size in disordered systems.

Area of Science:

  • Physics
  • Optics
  • Computational Physics

Background:

  • Random lasing is a complex phenomenon in disordered media.
  • Understanding mode behavior and localization is crucial for device applications.

Purpose of the Study:

  • To develop a computational model for simulating random lasing.
  • To investigate the relationship between system parameters and lasing mode characteristics.

Main Methods:

  • Coupling Maxwell's equations with electronic population rate equations.
  • Utilizing finite difference time domain (FDTD) methods for simulation.
  • Analyzing field patterns and spectra of localized modes.

Main Results:

  • A critical pumping rate (P(c)(r)) is identified for lasing onset.

Related Experiment Videos

  • The number of lasing modes scales with pumping rate and system length.
  • Mode repulsion phenomenon observed, leading to saturation in mode number.

    • Conclusions:

    • The model successfully simulates random lasing phenomena.
    • Mode repulsion influences mode density and establishes a relation between localization length (xi) and average mode length (L(m)).