Numerical study of random lasing in three dimensional amplifying disordered media

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...

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Bibliographic Details
Published in:Optics communications 2012-03, Vol.285 (6), p.1314-1322
Main Authors: Ghasempour Ardakani, Abbas, Bahrampour, Ali Reza, Mahdavi, Seyed Mohammad, Golshani Gharyeh Ali, Mojtaba
Format: Article
Language:English
Subjects:
Approximation
Density
FDTD method
Gain
Lasers
Lasing
Mathematical analysis
Random laser
Steady state
Three dimensional
Three dimensional disordered medium
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Summary: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.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2011.10.018