Abstract：In the present paper, aiming at the problem of laser induced breakdown spectroscopy (LIBS) applyication in ocean detection, the effects of laser wavelength on the detection of Ca in water solution were investigated. The evolvement characterization of electron density was studied by analyzing the time resolved spectra of the plasma. The experimental results show that the lifetime of plasma is about 1 200 and 600 ns respectively induced by 1 064 and 532 nm laser. Based on the optical transmission characteristic and the LIBS experimental results, the dependence of needed laser energy before incidence into water Eiopt(r) for optimal detection effect on the detection distance in water was found, and the dependence was simulated by applying to the in situ detection in water solution. The simulated results suggest that the needed laser energy of 1 064 nm laser before incidence into water is about 100 mJ when the detection distance is no larger than 5 cm. When the detection distance increases to 10cm, the needed laser energy of 532 nm before incidence into water is only about 30 mJ. So it should be considered to choose 532 nm laser as the ablation source with the increase in the in situ detection distance.
Key words：Laser induced breakdown spectroscopy;Laser wavelength;Detection in water solution;In situ detection distance
李 颖，王振南，吴江来，卢 渊，郑荣儿* . 激光波长对水中金属元素激光诱导击穿光谱探测的影响[J]. 光谱学与光谱分析, 2012, 32(03): 582-585.
LI Ying, WANG Zhen-nan, WU Jiang-lai, LU Yuan, ZHENG Rong-er* . Effects of Laser Wavelength on Detection of Metal Elements in Water Solution by Laser Induced Breakdown Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(03): 582-585.
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