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飞秒激光脉冲烧蚀高定向热解石墨喷射物的时间分辨荧光光谱研究

发表时间:2014-02-15  浏览量:2708  下载量:1534
全部作者: 张楠,冯培培
作者单位: 南开大学现代光学研究所,光电信息技术科学教育部重点实验室
摘 要: 使用单脉冲能量0.44 mJ的50 fs激光脉冲在大气中烧蚀高定向热解石墨,研究其烧蚀喷射物荧光光谱的超快时间演化。实验发现:在激光流量约100 J/cm2的飞秒脉冲作用下,烧蚀初期喷射物的荧光光谱为连续谱,光谱范围覆盖380~760 nm,这些连续谱主要为高流量飞秒激光与石墨作用产生的碳等离子体通过轫致辐射产生的光谱。随着时间延迟的增大,在连续谱上逐渐出现了分立的峰,这些峰的半高宽约为10~40 nm,它们主要是碳的二聚物(C2)导致的峰。当时间延迟达到微秒量级时,连续谱消失,最后只剩下分立的峰。
关 键 词: 光学;时间分辨的荧光光谱;飞秒激光烧蚀;高定向热解石墨
Title: Investigation of the time-resolved optical emission spectrum of the ejected material during femtosecond laser ablation of the highly oriented pyrolytic graphite
Author: ZHANG Nan, FENG Peipei
Organization: Key Laboratory of Opto-Electronics Information and Technical Science, Ministry of Education, Institute of Modern Optics, Nankai University
Abstract: In this paper, 50 fs laser pulses with single pulse energy of 0.44 mJ are used to ablate the highly oriented pyrolytic graphite target in ambient air. And the ultrafast temporal evolution of the optical emission spectrum of the ejected material generated by the ablation is studied. It is found that in the early time after the striking of the femtosecond laser pulses with a laser fluence of 100 J/cm2, the optical emission spectrum of the ejected material is continuum ranging from 380 nm to 760 nm, which can be mainly attributed to the carbon plasma’s spectrum generated through the bremsstrahlung. As time elapses, several distinctive narrow spectral bands appear on the top of the continuum. These narrow bands with a bandwidth of 10-40 nm(full width at half maximum)are mainly generated by the carbon dimer. When time delay reaches several microseconds, the continuum disappears firstly, and only the narrow bands are left.
Key words: optics; time-resolved optical emission spectrum; femtosecond laser ablation; highly oriented pyrolytic graphite
发表期数: 2014年2月第3期
引用格式: 张楠,冯培培. 飞秒激光脉冲烧蚀高定向热解石墨喷射物的时间分辨荧光光谱研究[J]. 中国科技论文在线精品论文,2014,7(3):206-210.
 
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