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Numerical study of random lasing in three dimensional amplifying disordered media

Ghasempour Ardakani, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.optcom.2011.10.018
  3. Publisher: 2012
  4. Abstract:
  5. 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
  6. Keywords:
  7. FDTD method ; Random laser ; Three dimensional disordered medium ; Active medium ; Central frequency ; Density of particles ; Disordered media ; Disordered system ; Governing equations ; Lasing action ; Lasing modes ; Lasing threshold ; Numerical studies ; Output power ; Population inversions ; Pumping rate ; Quasi steady state approximation ; Random lasers ; Random lasing ; Random systems ; Spherical dielectric particles ; Upper limits ; Finite difference time domain method ; Laser beams ; Numerical methods ; Three dimensional
  8. Source: Optics Communications ; Volume 285, Issue 6 , 2012 , Pages 1314-1322 ; 00304018 (ISSN)
  9. URL: http://www.sciencedirect.com.ezp2.semantak.com/science/article/pii/S0030401811011011