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Effect of Pump Area on Lasing Modes in Active Random Media |
| XIE Ying-Mao1,2;LIU Zheng-Dong1,3 |
| 1School of Material Science and Engineering, Nanchang University, Nanchang 330047
2Department of Physics and Electronic Information Science, Gannan Teachers College, Ganzhou 341000
3Institute of Modern Physics, Nanchang University, Nanchang 330047 |
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| Cite this article: |
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XIE Ying-Mao, LIU Zheng-Dong 2005 Chin. Phys. Lett. 22 2827-2830 |
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Abstract We investigate the effect of pump area on lasing modes in an active random medium. Considering the structure characteristics in a real experimental system, the random medium is divided into two regions, i.e. pump and non-pump areas. The dependence of lasing modes on the pump area is qualitatively explained by means of the model in which the lasing is ascribed to the interaction of the complex localized modes in the active random medium with local aperiodic quasi-structure with appropriate pump light. There exist different pump sizes for lasing with different modes. As the pump size decreases in this random system, the pump threshold of the lasing modes increases. There are different lasing modes in different excitation regions in this random system. This gives us some information about the dependence of lasing modes on pump areas in active random media.
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| Keywords:
42.55.Zz
42.25.Dd
72.15.Rn
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Published: 01 November 2005
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| PACS: |
42.55.Zz
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(Random lasers)
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42.25.Dd
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(Wave propagation in random media)
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72.15.Rn
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(Localization effects (Anderson or weak localization))
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