摘要
建立了用来研究超快传热现象的飞秒激光泵浦-探测热反射系统。利用该系统测量并得到了在140fs(飞秒)超短脉冲激光加热下,50nm金膜的非平衡电子温升引起的反射信号随时间的变化曲线。由于加热光单脉冲能量密度只有5×10^(-3)mJ/cm^2,估算最高温升在10K以内,这有效地减小了由于物性参数随温度变化而引起的误差。论文介绍了在系统的调试过程中,各种因素对实验结果的影响,并对实验结果及数据处理方法进行了讨论。
Femtosecond laser pump-probe thermoreflectance system was founded and used to in- vestigate energy deposition and transport during the early period of ultra-short pulse laser heating of 50-nm-thick golden film.The laser pulse duration is 140 fs and the heating energy density of one pulse is only 5×10^(-3)mJ/cm^2.As the maximal electron temperature change is less than 10 K,the imprecision of measurement,caused by varying parameters with temperature,effectively reduces.The experiment results were given,and th...
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第7期1227-1230,共4页
Journal of Engineering Thermophysics
基金
中国科学院“百人计划”项目
关键词
飞秒激光泵浦-探测系统
超短脉冲激光加热
金膜
femtosecond laser pump-probe system
ultra-short pulse laser heating
golden film
