本文關(guān)鍵詞： LA-LIBS 雙脈沖 元素分析 微損傷　出處：《光譜學與光譜分析》2017年01期 　論文類型：期刊論文

【摘要】：研究了基于一臺皮秒Nd∶YAG激光器實現(xiàn)合金樣品的雙脈沖激光剝離-激光誘導擊穿光譜(LALIBS)微損元素分析。實驗采用低能量的532nm二倍頻激光燒蝕并剝離出微量樣品,然后采用較高能量的延時1064nm激光對剝離出的樣品進行二次激發(fā),以增強等離子體中的原子輻射強度和提高光譜檢測靈敏度。實驗分別研究了燒蝕激光脈沖和二次激發(fā)光脈沖的能量對信號強度的影響。在燒蝕激光脈沖能量為10μJ,二次激發(fā)光脈沖能量為2.5mJ的條件下,LA-LIBS中CuⅠ324.75nm原子譜線的強度與單脈沖LIBS相比改善了86倍,激光燒蝕坑洞的直徑小于10μm。研究表明:基于一臺皮秒Nd∶YAG激光器,采用雙脈沖LA-LIBS技術(shù)可以較好地實現(xiàn)對固體樣品的微損元素分析。該技術(shù)在貴重樣品分析和高空間分辨的二維元素顯微分析中具有一定的應用價值。
[Abstract]:The micro-loss element analysis of alloy samples based on a picosecond Nd:YAG laser has been studied. The low energy 532 nm double frequency laser ablation and stripping of trace samples have been carried out by means of laser stripping and laser-induced breakdown spectroscopy (LLIBS). Then the laser with a high energy delay of 1064nm was used to excite the peeled sample twice. In order to enhance the atomic radiation intensity in plasma and improve the spectral detection sensitivity, the effects of the energy of ablated laser pulse and secondary excited laser pulse on the signal intensity were studied experimentally. The intensity of Cu 鈪，

本文編號：1533001