Abstract
Dual-beam laser induced breakdown spectroscopy (LIBS) is more sensitive than conventional single-pulse LIBS. A combined configuration of Nd:YAG and CW- CO2 lasers is used to improve the emission intensity of LIBS. The plasma of Al sample was observed under CW-CO2 laser and Nd:YAG laser excitation. The enhancement radiation was obtained from dual-beam LIBS rather than single LIBS, which indicated that IR preheating can cause significant enhancement of plasma. The effects of CO2 laser spot size, laser irradiation time and laser power on plasma emission intensity were investigated. And on this basis, the variation of electron temperature and electron density of plasma with delay time is obtained.
Highlights
laser induced breakdown spectroscopy (LIBS) technology is a widely used elemental analysis method, Such as environmental monitoring, medical analysis, semiconductor materials detection, pesticide residue detection and archaeological applications.[1,2,3,4,5] LIBS technology uses intense laser to excite the target material, melt the material to produce the plasma
We investigated the enhancement effect of CO2 laser irradiation on the plasma emission excited by the Nd:YAG laser
The results show that the power of the preheating laser has a great influence on the emission intensity of the plasma, and the CO2 beam spot size has the same effect
Summary
LIBS technology is a widely used elemental analysis method, Such as environmental monitoring, medical analysis, semiconductor materials detection, pesticide residue detection and archaeological applications.[1,2,3,4,5] LIBS technology uses intense laser to excite the target material, melt the material to produce the plasma. There are many mature methods for measuring the spectrum, such as inductively coupled-plasma mass-spectrometry (ICP-MS), Atomic Absorption Spectroscopy (AAS). These methods have more or less disadvantages, such as time-consuming, unable to detect online, higher cost, etc.[1,6,7,8] Compared with these traditional spectral measurement methods, LIBS technology has advantages such as high speed, non-destructive samples, and real-time online measurement. The results show that the power of the preheating laser has a great influence on the emission intensity of the plasma, and the CO2 beam spot size has the same effect. The plasma electron temperature and density are calculated by the LIBS spectrum in order to better explain the enhancement mechanism
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