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激光诱导薄膜等离子体点燃时间及其影响因素

Ignition Time of Laser-Induced Film Plasma and Its Influence Factors

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摘要

将波长为1064 nm的纳秒Nd∶YAG脉冲激光聚焦在单层Al膜上,诱导其产生等离子体闪光,模拟计算了等离子体闪光的点燃时间(tm),分别得到了tm与激光波长、入射激光能量、聚焦光斑半径、脉宽等激光作用参数的关系曲线,研究分析了薄膜材料、薄膜表面杂质和缺陷对tm大小的影响。结果表明,激光聚焦光斑和脉宽越大,tm就越大;激光波长和入射激光能量越大,tm越小;薄膜材料电离能越小,tm越小;薄膜表面存在杂质和缺陷时,tm变小。这些结果对关于激光维持燃烧波和爆轰波的产生机制的研究提供了一定的参考。

Abstract

Laser plasma flash is induced when a nanosecond Nd∶YAG pulsed laser with wavelength of 1064 nm is focused on monolayer aluminum film. The ignition time of laser-induced film plasma (tm) is calculated with simulation method, and the relationship between tm and the laser wavelength, incident laser energy, focusing spot radius and pulse width is obtained, respectively. The results show that tm increases with laser focusing spot radius and pulse width increasing, and decreases with laser wavelength and incident laser energy increasing. In addition, the smaller the ionization energy of thin film materials, the smaller tm. When impurities and defects exist in films, tm becomes small. Such results provide a certain reference to the research on the generation mechanism of laser-sustained combustion and detonation wave.

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中图分类号:O437

DOI:10.3788/aos201737.0431001

所属栏目:薄膜

基金项目:国家自然科学基金(61378050)、科技部国际科技合作项目(2013DFR70620)

收稿日期:2016-10-10

修改稿日期:2016-11-24

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汪桂霞:西安工业大学光电工程学院, 陕西 西安 710021
苏俊宏:西安工业大学光电工程学院, 陕西 西安 710021
徐均琪:西安工业大学光电工程学院, 陕西 西安 710021
杨利红:西安工业大学光电工程学院, 陕西 西安 710021
吴慎将:西安工业大学光电工程学院, 陕西 西安 710021

联系人作者:汪桂霞(xinwan820412@sina.com)

备注:汪桂霞(1982-),女,博士研究生,讲师,主要从事激光薄膜损伤方面的研究。

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引用该论文

Wang Guixia,Su Junhong,Xu Junqi,Yang Lihong,Wu Shengjiang. Ignition Time of Laser-Induced Film Plasma and Its Influence Factors[J]. Acta Optica Sinica, 2017, 37(4): 0431001

汪桂霞,苏俊宏,徐均琪,杨利红,吴慎将. 激光诱导薄膜等离子体点燃时间及其影响因素[J]. 光学学报, 2017, 37(4): 0431001

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