Time-resolved and time-integrated single-shot laser-induced plasma experiments using nanosecond and femtosecond laser pulses
Time-resolved and time-integrated single-shot laser-induced plasma experiments using nanosecond and femtosecond laser pulses
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DOI：
10.1016/j.sab.2004.05.009
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发表时间：
2004-07
期刊：
影响因子：
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通讯作者：
J. Sirven;B. Bousquet;L. Canioni;L. Sarger
中科院分区：
文献类型：
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作者：
J. Sirven;B. Bousquet;L. Canioni;L. Sarger
使用独特的啁啾脉冲放大 (CPA) 激光系统对单次激光诱导击穿光谱 (LIBS) 测量进行比较。根据飞秒 Ti/Sa 振荡器的注入，可以访问两种不同的时间范围（飞秒和纳秒），同时保持样品上相同的波长和注量 (≈ 100 J/cm2)。样品为未抛光的纯铝板。在纳秒和飞秒范围内获得的时间分辨光谱首先分析了与轫致辐射过程相关的众所周知的连续发射，然后分析了铝的原子和离子谱线。连续谱和谱线的时间行为更多地取决于激光注量而不是脉冲持续时间。当激光能量密度除以二时，研究了发射线强度水平的变化。纳秒范围内的信噪比比飞秒范围内的信噪比弱。然而，时间积分单次 LIBS 在飞秒和纳秒范围内得到了证明。
A comparison of single-shot laser-induced breakdown spectroscopy (LIBS) measurements is performed using a unique chirped pulse amplification (CPA) laser system. Depending on the injection by a femtosecond Ti/Sa oscillator, two different temporal regimes can be accessed (femtosecond and nanosecond) while keeping the same wavelength and fluence on the sample (≈ 100 J/cm2). The sample is a nonpolished pure aluminum plate. Time-resolved spectra obtained in both the nanosecond and the femtosecond regimes are analyzed concerning first the well-known continuum emission related to the Bremsstrahlung process and then the atomic and ionic spectral lines of aluminum. The temporal behaviors of the continuum and of the spectral lines depend much more on the laser fluence than on the pulse duration. The changes in the intensity levels of the emission lines are investigated when the laser fluence is divided by two. The signal to noise ratio is weaker in the nanosecond regime than in the femtosecond one. However, time-integrated single-shot LIBS is demonstrated in both the femtosecond and nanosecond regimes.