Research on Temporal and Spatial Evolution of Reheating Double-Pulse Laser-Induced Plasma
WANG Jing-ge1, FU Hong-bo1, NI Zhi-bo1, HE Wen-gan1, CHEN Xing-long1, 2, DONG Feng-zhong1, 3*
1. Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. School of Instrument Science & Opto-Electronic Engineering, Hefei University of Technology, Hefei 230009, China 3. School of Environment Science and Optoelectronic Technology，University of Science and Technology of China, Hefei 230026, China
Abstract：In order to investigate the emission enhancement mechanisms of reheating Double Pulse Laser-Induced Breakdown Spectroscopy (DP-LIBS), single pulse LIBS (SP-LIBS) and reheating DP-LIBS were carried out on an alloy steel sample respectively. The plasma emission was collected by an Echelle spectrometer with high resolution, while the plasma structure was monitored via fast-photography. The temporal and spatial evolutio ns of the plasma generated by SP-LIBS and reheating DP-LIBS were being studied. It is found that the plasma temperature in reheating DP-LIBS was higher than that of SP-LIBS, and there was a turning point for the decay rate of plasma temperature in reheating DP-LIBS when the delay time was equal to the inter-pulse time of DP-LIBS. Moreover, the inte nsity of the plasma image was increased by reheating DP-LIBS, and the height and width of the central region of the plasma were increased about 23.5% and 15.1% respectively. The results of spatial distribution showed that the inte nsity of Fe Ⅱ and N I lines in the plasma were obviously enhanced by reheating DP-LIBS when the distance from the sample surface was larger than 0.6 mm. While the inte nsity enhancement for Fe Ⅰ lines were little, even in some positio ns the inte nsity of Fe Ⅰ lines decreased. The plasma temperature of double-pulse configuration was about 2 000 K higher than that of SP-LIBS, and a larger hot region in the plasma was generated. It is evidenced that the emission enhancement mechanisms in reheating DP-LIBS is that the second laser pulse re-excited the plasma induced by the first laser pulse, and the higher plasma temperature resulted from the re-exciting process.
Key words：Reheating double pulse;Laser-induced plasma;Temporal and spatial evolution
王静鸽1，付洪波1，倪志波1，贺文干1，陈兴龙1, 2，董凤忠1, 3* . 再加热双脉冲激光诱导等离子体的时空演变特性研究 [J]. 光谱学与光谱分析, 2016, 36(03): 817-822.
WANG Jing-ge1, FU Hong-bo1, NI Zhi-bo1, HE Wen-gan1, CHEN Xing-long1, 2, DONG Feng-zhong1, 3* . Research on Temporal and Spatial Evolution of Reheating Double-Pulse Laser-Induced Plasma . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(03): 817-822.
[1] Gruber J, Heitz J, Arnold N, et al, Appl. Spectroscopy, 2004, 58(4): 457. [2] Sturm V, Schmitz H U, Reuter T, et al. Spectrochim. Acta Part B, 2008, 63(10): 1167. [3] Pandhija S, Rai N K, Rai A K, et al. Appl. Phys. B-Lasers Opt., 2010, 98(1): 231. [4] Gallou G, Sirven J B, Dutouquet C, et al. Aerosol Science and Technology, 2011, 45(8): 918. [5] Emily R Schenk, Jose R. Almirall, Appl. Optics, 2010, 49(13): C153. [6] Osticioli I, Wolf M, Anglos D, Appl. Spectrosc., 2008, 62(11): 1242. [7] Salle B, Cremers D A, Maurice S, et al. Spectrochim. Acta Part B, 2005, 60(4): 479. [8] David A Cremers, Leon J Radziemski, Thomas R Loree. Appl. Spectrosc., 1984, 38(5): 721. [9] Dimitra N Stratis, Kristine L Eland, Michael S Angel. Appl. Spectrosc., 2000, 54(12): 1719. [10] St-Onge L, Detalle V, Sabsabi M. Spectrochim. Acta Part B, 2002, 57(1): 121. [11] Babushok V I, DeLucia Jr. F C, Gottfried J L, et al. Spectrochim. Acta Part B, 2006, 61(9): 999. [12] Colaoa F, Lazica V, Fantonia R. Spectrochim. Acta Part B, 2002, 57(7): 1167. [13] De Giacomo A, Dell’Aglio M b, Bruno D, et al. Spectrochim. Acta Part B , 2008, 63(7): 805. [14] Cristoforetti G, Legnaioli S, Pardini L, et al. Spectrochim. Acta Part B, 2006, 61(3): 340. [15] Ce’line Gautier, Pascal Ficheta, Denis Menut, et al. Spectrochim. Acta Part B, 2005, 60(2): 265. [16] WANG Qi, DONG Feng-zhong, LIANG Yun-xian, et al(王 琦, 董凤忠, 梁云仙，等), Acta Optica Sinica(光学学报), 2011, 31(10): 10330002.
