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Absorption-induced confinement of lasing modes in diffusive random media.

A Yamilov1, X Wu, H Cao

  • 1Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA. yamilov@umr.edu

Optics Letters
|October 4, 2005
PubMed
Summary

Reabsorption in diffusive random media confines lasing modes to the pumped region, unlike passive systems. This effect reduces effective system size, broadening decay rates and enabling discrete lasing peaks.

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Area of Science:

  • Condensed matter physics
  • Photonics
  • Wave phenomena in disordered systems

Background:

  • Diffusive random media support complex wave phenomena.
  • Understanding lasing modes is crucial for optical device applications.
  • Local pumping introduces unique feedback mechanisms.

Purpose of the Study:

  • To numerically investigate lasing modes in diffusive random media with local pumping.
  • To analyze the impact of light reabsorption on lasing mode characteristics.
  • To compare lasing modes with quasi-modes of passive systems.

Main Methods:

  • Numerical simulations of light propagation and amplification in disordered media.
  • Modeling of local gain (pumping) and light reabsorption.
  • Analysis of mode confinement, decay rates, and spatial distribution.

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Main Results:

  • Light reabsorption significantly alters feedback, effectively reducing the system size.
  • Lasing modes are confined to the pumped volume, unlike extended quasi-modes in passive systems.
  • Absorption broadens decay rate distributions, promoting discrete lasing peaks.

Conclusions:

  • Local pumping and reabsorption fundamentally change lasing mode behavior in diffusive media.
  • The effective system size reduction is a key factor in mode confinement.
  • These findings offer insights into designing and optimizing lasers in complex media.