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首页> 外文会议>Conference on laser applications in microelectronic and optoelectronic manufacturing VII; 20090126-29; San Jose, CA(US) >Inflection point of the spectral shifts of the random lasing in dye solution showing transformation to weak localization
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Inflection point of the spectral shifts of the random lasing in dye solution showing transformation to weak localization

机译：染料溶液中随机激光光谱位移的拐点显示出向弱局部化的转变

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摘要

We studied the spectral shift of random lasing in the Rhodamine 6G dye solution with TiO_2 nanoscatterers under picosecond pulses pumping. The red shift, resulting from the re-absorption and re-emission of the dye, indicates a longer optical path length of the emitted laser traveling inside the medium. Thus the optical paths of the random laser in the solution can be estimated using the values of red shifts for different dye concentrations and scatterer densities. The diffusion theory is provided and the theoretical results agree very well with that calculated from the red shifts before the inflection points appear for increasing scatterer density. The followed increasing scatterer density results in the lights staying longer in the medium, in contrast to that predicted by the diffusion theory. So it is clear that the inflection point shows that the system is changing from a diffusion system to a weakly localized one in which the light stay longer because of the localization.
机译：我们研究了皮秒脉冲泵浦下具有TiO_2纳米散射体的若丹明6G染料溶液中随机激光的光谱位移。染料的重新吸收和重新发射导致的红移表示在介质内部传播的发射激光的光程更长。因此，对于不同的染料浓度和散射密度，可以使用红移值来估计溶液中随机激光的光路。提供了扩散理论，理论结果与拐点出现以增加散射体密度时的红移计算的结果非常吻合。随之而来的散射体密度的增加导致光在介质中停留的时间更长，这与扩散理论所预测的相反。因此很明显，拐点表明该系统正在从扩散系统变为弱定位系统，该系统由于定位而使光停留的时间更长。

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