Chin. Phys. Lett.  2003, Vol. 20 Issue (2): 293-295    DOI:
Original Articles |
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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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.
Keywords: 78.45.+h      78.90.+t      33.70.-w      42.55.Mv     
Published: 01 February 2003
PACS:  78.45.+h (Stimulated emission)  
  78.90.+t (Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter)  
  33.70.-w (Intensities and shapes of molecular spectral lines and bands)  
  42.55.Mv (Dye lasers)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2003/V20/I2/0293
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