Emission Characteristics of Laser-Induced Plasma Using Collinear Long and Short Dual-Pulse Laser-Induced Breakdown Spectroscopy (LIBS)
Emission Characteristics of Laser-Induced Plasma Using Collinear Long and Short Dual-Pulse Laser-Induced Breakdown Spectroscopy (LIBS)
复制标题
使用共线长短双脉冲激光诱导击穿光谱 (LIBS) 的激光诱导等离子体的发射特性
DOI：
10.1177/0003702817693239
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发表时间：
2017-09-01
影响因子：
3.5
通讯作者：
Shiou, Fang-Jung
中科院分区：
文献类型：
--
作者：
Wang, Zhenzhen;Deguchi, Yoshihiro;Shiou, Fang-Jung
利用共线长、短双脉冲激光诱导击穿光谱(DP-LIBS)研究了激光诱导等离子体的发射特性。在自由运转(FR)条件下，用脉冲宽度为60 μ的S激光作为外能源，实现了等离子体的稳定和稳定。比较了单脉冲LIBS(SP-LIBS)和DP-LIBS(DP-LIBS)对空气中不锈钢的测量结果，发现DP-LIBS的发射强度明显增强。在不同的选通延迟时间和短脉宽激光功率条件下，DP-LIBS诱导的等离子体温度与短SP-LIBS的测量结果相比，保持在较高的温度。此外，使用DP-LIBS测量的等离子体温度变化率也较低。通过对水中铝样品的测定，验证了该方法具有较高的检测能力。用DP-LIBS可以清楚地检测到光谱，而用短脉冲宽度和长脉冲宽度的SP-LIBS不能识别光谱。讨论了选通延迟时间和短脉宽激光功率对激光输出的影响。这些结果证明了所提出的长短共线DP-LIBS方法的可行性和增强的检测能力。
Collinear long and short dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) was employed to clarify the emission characteristics from laser-induced plasma. The plasma was sustained and became stable by the long pulse-width laser with the pulse width of 60 μs under free running (FR) conditions as an external energy source. Comparing the measurement results of stainless steel in air using single-pulse LIBS (SP-LIBS) and DP-LIBS, the emission intensity was markedly enhanced using DP-LIBS. The temperature of plasma induced by DP-LIBS was maintained at a higher temperature under different gate delay time and short pulse-width laser power conditions compared with those measured using short SP-LIBS. Moreover, the variation rates of plasma temperatures measured using DP-LIBS were also lower. The superior detection ability was verified by the measurement of aluminum sample in water. The spectra were clearly detected using DP-LIBS, whereas it cannot be identified using SP-LIBS of short and long pulse widths. The effects of gate delay time and short pulse-width laser power were also discussed. These results demonstrate the feasibility and enhanced detection ability of the proposed collinear long and short DP-LIBS method.