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Lasering in a Waveguide with Scatterers in Diameter 20nm |
| LIU Chun-Xu1;LIU Jun-Ye1;ZHANG Jia-Hua1;DOU Kai2 |
| 1Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033
2Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA |
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| Cite this article: |
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LIU Chun-Xu, LIU Jun-Ye, ZHANG Jia-Hua et al 2004 Chin. Phys. Lett. 21 1948-1950 |
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Abstract We report random lasing achieved in a MEH-PPV/glass waveguide with the TiO2 scatterers in diameter 20nm that is significantly smaller than submicrometre of TiO2 scatterers in the films or suspensions previously reported on random lasing. The spectral lines are dramatically narrowed by almost two orders of magnitude compared with those excited by a xenon lamp. The amplified spontaneous emission is identified as the dominant mechanism in our system. Light localization might be achieved in a broad class of random materials based on the features of the mean free path l*=5.4×105nm, kl*>>1 and the Thouless number 6.73×10-5 with k being the wave number.
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| Keywords:
42.55.Zz
72.15.Rn
78.55.Qr
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Published: 01 October 2004
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| PACS: |
42.55.Zz
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(Random lasers)
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72.15.Rn
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(Localization effects (Anderson or weak localization))
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78.55.Qr
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(Amorphous materials; glasses and other disordered solids)
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