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Numerical study of random lasing in three dimensional amplifying disordered media

Authors
Journal
Optics Communications
0030-4018
Publisher
Elsevier
Publication Date
Volume
285
Issue
6
Identifiers
DOI: 10.1016/j.optcom.2011.10.018
Keywords
  • Random Laser
  • Fdtd Method
  • Three Dimensional Disordered Medium

Abstract

Abstract In this paper, the lasing action in three-dimensional active random systems has been numerically investigated. Here, random systems of spherical dielectric particles imbedded in an active medium are considered. The quasi steady state approximation for the population inversion of the active medium is applied to solve three dimensional governing equations. Results show that when the density of particles increases to an upper limit, the intensity of lasing modes is enhanced. Also, the effects of pumping rate and particle size on the number of lasing modes and their intensity are studied. Lasing threshold of laser modes in different disordered systems is calculated and it is shown that by an appropriate selection of the central frequency of gain line-shape, the output power intensity of random lasers increases. These results are in agreement with the experimental results observed by others.

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