期刊
OPTICS COMMUNICATIONS
卷 285, 期 24, 页码 5276-5282出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2012.06.094
关键词
Random laser; Dye laser; Refractive index; Mie theory; Multi-scattering
类别
资金
- National Natural Science Foundation of China (NSFC) [60890200]
- NSFC [10976017]
We report a systematic study based on the random laser behaviors of comparable systems in which the refractive indices are varied. Threshold and spectra features have been obtained. The experimental results indicate that the threshold (E-th) of the random laser depends on the refractive index of the scatterers and surrounding solvents. The larger the refractive index of scatters or smaller the refractive index of solvents is, the smaller the E-th will be. The theoretical explanation based on Mie scattering theory for this phenomenon is made. We introduce refractive index contrast-ratio w. The thresholds variation is attributed to the alteration of w which influences the scattering strength and the transport mean free path. As for the spectra, typical emission evolution spectra have been observed. The peak positions vary with the change of scatterers and solvents, the reason of the variation is the absorption of the samples. (C) 2012 Elsevier B.V. All rights reserved.
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