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Mechanism of Low Threshold Lasing of Dye Solution Embedding in Nanoparticle Fractal Aggregates |
| HE Yong-Jun;HUANG Zhen-Li;WANG He-Zhou |
| Institute for Laser and Spectroscopy, Zhongshan University, Guangzhou 510275 |
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| Cite this article: |
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HE Yong-Jun, HUANG Zhen-Li, WANG He-Zhou 2003 Chin. Phys. Lett. 20 293-295 |
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Abstract We study the single-photon and two-photon induced emission properties of dye solution embedded with nanoparticle fractal aggregates. The spectral and temporal experimental results show that the lasing threshold of single-photon absorption of dye solution embedded with TiO2 nanoparticle fractal aggregates is significantly reduced compared to that of a neat dye solution; while that of two-photon absorption does not. These experimental results imply that this low threshold single-photon absorption lasing mainly results from the mechanism of random walking, instead of Anderson localization, unless something about two-photon induced emission is unknown.
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| Keywords:
78.45.+h
78.90.+t
33.70.-w
42.55.Mv
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Published: 01 February 2003
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78.45.+h
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(Stimulated emission)
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78.90.+t
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(Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter)
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33.70.-w
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(Intensities and shapes of molecular spectral lines and bands)
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42.55.Mv
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(Dye lasers)
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