Shui Min, Jin Xiao, Li Zhongguo, Yang Junyi, Shi Guang, Zhang Xueru, Wang Yuxiao, Yang Kun, Wei Tai-huei, Song Yinglin
School of Physical Science and Technology, Soochow University, Suzhou, China.
Opt Express. 2010 Dec 20;18(26):27387-403. doi: 10.1364/OE.18.027387.
Nonlinear absorption of a newly synthesized organic inner salt Ge-150 dissolved in four different solvents (DMF, DMSO, acetonitrile and acetone) is investigated by the Z-scan technique with both nanosecond and picosecond pulses. When pulse energy surpasses a threshold and pulse-to-pulse separation is shorter than a characteristic time, all the four solutions show absorption weakening induced by cross-pulse effects in the picosecond regime. However, only two of them (Ge-150 dissolved in DMF and DMSO) show this weakening in the nanosecond regime. By conducting a simple verification experiment, we verify this absorption weakening is induced by solute damage related to solvent effect rather than solute migration. A simple theoretical model is proposed to interpret the experimental phenomenon.
采用Z扫描技术，分别用纳秒脉冲和皮秒脉冲研究了新合成的有机内盐Ge - 150溶解在四种不同溶剂（N，N - 二甲基甲酰胺、二甲基亚砜、乙腈和丙酮）中的非线性吸收特性。当脉冲能量超过阈值且脉冲间隔短于特征时间时，在皮秒脉冲条件下，所有四种溶液均表现出由交叉脉冲效应引起的吸收减弱现象。然而，在纳秒脉冲条件下，只有其中两种溶液（Ge - 150溶解在N，N - 二甲基甲酰胺和二甲基亚砜中）表现出这种吸收减弱现象。通过进行简单的验证实验，我们证实这种吸收减弱是由与溶剂效应相关的溶质损伤引起的，而非溶质迁移。并提出了一个简单的理论模型来解释该实验现象。
