中国光学2016，Vol.9Issue(2)：249-254,6.DOI:10.3788/CO.20160902.0249
基于Ti O2纳米粒子薄膜的低阈值随机激光器的动力学研究
Dynamics of low-threshold random laser based on TiO2 nanoparticle films
摘要
Abstract
We have prepared random lasers with conjugated polymer(MEH-PPV)coated on TiO2 nanoparticle films.The threshold of the lasing based on random TiO2 nanoparticle film is significantly reduced by a factor of 9 in comparison with the amplified spontaneous emission(ASE)threshold of the flat MEH-PPV film,which is caused by multiple scattering induced by TiO2 nanoparticles.Further investigation by femtosecond fluorescence up-conversion experiment reveals that the dwell time of light inside the gain medium is increased in the random laser device,which directly confirms that light travels longer path due to the multiple scattering in the random structure.So it stimulates the emission of more light and the threshold of the random laser is lowered.关键词
随机激光器/TiO2纳米粒子/共轭聚合物/飞秒荧光上转换Key words
random lasers/TiO2 nanoparticle/conjugated polymer/femtosecond fluorescence up-conversion分类
信息技术与安全科学引用本文复制引用
杜江林,高炳荣,王海宇,陈岐岱..基于Ti O2纳米粒子薄膜的低阈值随机激光器的动力学研究[J].中国光学,2016,9(2):249-254,6.基金项目
国家重点基础研究发展计划（973计划）资助项目（No．2014CB921302）；国家自然基金资助项目（No．21473077，No21273096）；教育部博士点基金资助项目（No．20130061110048）Supported by National Program on Key Basic Research Projects of China（No．2014CB921302），Supported by Na-tional Natural Science Foundation of China（No．21473077，No21273096），Doctoral Scientific Fund Project of the Ministry of Education of China （）
