中文摘要：

利用Z扫描方法研究了普洱茶的非线性光学效应,发现普洱茶水溶液在连续光下具有很高的非线性折射率,与CS2相比高达6个数量级,尤其是在普洱茶水溶液中观察到了光速减慢到超光速的转换过程,实验结果显示了光波位相耦合色散效应导致光速变化机制的普适性.

英文摘要：

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.