阶跃光激励的光热光偏转实验系统及实验结果分析

摘要

Based on the principle of the photothermal deflection technique,the experiment system of the photothermal deflection technique with step optical excitation is established.The relation-ship between the photothermal deflection signals and the power of excitation beams is explored.The experiment conditions and the physical parameters of samples,which have effect on the photothermal deflection signals,are studied.The regularity between the real-time signals and the distance from probe beams to the sample surface,as well as the sample′s thermal diffusivity,is acquired and discussed.%根据光热光偏转技术原理,设计了一套阶跃光激励的光热光偏转实验系统,并利用该实验系统研究了光热光偏转信号与激励光功率的关系;探索了实验条件和样品热学参数对光热光偏转信号的影响,获得了信号随探测光距样品表面的距离以及样品热扩散率的变化规律。