Numerical study of random lasing in three dimensional amplifying disordered media |
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| Authors: | Abbas Ghasempour Ardakani Ali Reza Bahrampour Seyed Mohammad Mahdavi Mojtaba Golshani Gharyeh Ali |
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| Affiliation: | 1. Department of Physics, Sharif University of Technology, Tehran, Iran;2. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran;1. School of Electronics and Information Engineering, Tianjin Polytechnic University Tianjin 300387, China;2. School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China;3. Key Laboratory of Advanced Textile Composites, Ministry of Education of China, Tianjin 300387, China;4. College of Science, Civil Aviation University of China, Tianjin 300300, China;5. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China;1. Department of Surgery, University of Michigan Health System, 1500 East Medical Center Drive, Ann Arbor, MI 48109, USA;2. Cancer Programs, American College of Surgeons, 633 North Saint Clair Street, Chicago, IL 60611-3211, USA;3. Department of Surgery, NorthShore University HealthSystem, Evanston Hospital, 2650 Ridge Avenue, Evanston, IL 60201, USA;1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, PR China;2. Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 200050, PR China;1. School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang 212003, People?s Republic of China;2. State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, People?s Republic of China;1. Information Physics Research Center and Department of Applied Physics, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China;2. Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China |
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| 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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