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《Chinese Science Bulletin》 2010-01
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The nonlinear optical effect and group velocity control in Pu-erh tea solution

TANG BaiQuan1,2,XIANG YinXiao1,2,ZHANG WenDing1,2,GAO Feng1,2,QI JiWei1,2,WANG ZhenHua1,2,ZHANG XinZheng1,2,ZHANG GuoQuan1,2 & XU JingJun1,2 1 Photonics Center,College of Physics Science,Nankai University,Tianjin 300071,China;2 Key Laboratory of Weak Light Nonlinear Photonics(Nankai University),Ministry of Education,Tianjin 300457,China  
The nonlinear optical effect of the Pu-erh tea solution of water was studied by Z-scan technique,and a high nonlinear refractive index was found with continuous laser,which was six orders of magnitude larger than that of CS2.Especially,a conversion from subluminal light to superluminal light was observed in our sample,which demonstrates that the controlling of the group velocity of light based on the dispersive effect of phase coupling is applicable widely to nonlinear materials.
【Fund】: 弱光非线性光子学科学与技术创新引智基地(编号:B07013);; 国家重点基础研究发展计划(编号:2007CB307002);; 教育部科技创新工程重大项目培育资金项目(编号:708022);; 天津市国际科技合作项目(编号:06YFGHHZ00800)资助
【CateGory Index】: TS272.5
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