Li Shuo, Liu Lei, Yan Aidong, Huang Sheng, Huang Xi, Chen Rongzhang, Lu Yongfeng, Chen Kevin
Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
Rev Sci Instrum. 2017 Feb;88(2):023109. doi: 10.1063/1.4975597.
This paper reports the development of a compact double-pulse laser system to enhance laser induced breakdown spectroscopy (LIBS) for field applications. Pumped by high-power vertical-surface emitting lasers, the laser system that produces 16 ns pulse at 12 mJ/pulse with total weight less than 10 kg is developed. The inter-pulse delay can be adjusted from 0μs with 0.5μs increment. Several LIBS experiments were carried out on NIST standard aluminum alloy samples. Comparing with the single-pulse LIBS, up to 9 times enhancement in atomic emission line was achieved with continuum background emission reduced by 70%. This has led to up to 10 times improvement in the limit of detection. Signal stability was also improved by 128% indicating that a more robust and accurate LIBS measurement can be achieved using a compact double-pulse laser system. This paper presents a viable and field deployable laser tool to dramatically improve the sensitivity and applicability of LIBS for a wide array of applications.
本文报道了一种紧凑型双脉冲激光系统的研发情况，该系统旨在增强用于现场应用的激光诱导击穿光谱技术（LIBS）。该激光系统由高功率垂直表面发射激光器泵浦，能产生脉宽为16 ns、单脉冲能量为12 mJ且总重量小于10 kg的脉冲。脉冲间延迟可在0 μs至0 μs范围内以0.5 μs的增量进行调节。在国家标准与技术研究院（NIST）标准铝合金样品上进行了多项LIBS实验。与单脉冲LIBS相比，原子发射线增强了9倍，连续背景发射降低了70%。这使得检测限提高了10倍。信号稳定性也提高了128%，表明使用紧凑型双脉冲激光系统可实现更稳健、准确的LIBS测量。本文展示了一种可行且可用于现场的激光工具，能显著提高LIBS在广泛应用中的灵敏度和适用性。
