激光等离子体发射光光纤耦合系统设计与实验分析

设计的激光等离子体发射光光纤耦合系统，可以在提高等离子体发射光光纤耦合效率的同时减小耦合系统的尺寸，从而为激光诱导击穿光谱技术应用到快速、现场、在线的物质成分分析提供硬件基础。耦合系统为三镜片结构，通过单片透镜对等离子体发射光进行准直并通过由两片负、正透镜组成的反远距物镜结构将光束耦合进入光纤。耦合系统对等离子体发射光在铅、铜、镍、铬以及镉等元素的分析线波长处的光纤耦合效率均高于92％，且系统孔径小于6 mm，系统总长小于30 mm。采用所设计的耦合系统对土壤中的铬元素以及某铅蓄电池厂固体废弃物铅泥中的铅元素进行了检测，并与采用一般双透镜收集系统以及光纤直接接收的方式进行比较，进一步验证了耦合系统所获取光谱的元素特征谱线更加明显并易于识别，同时所得元素检测限更低，且光谱数据稳定，更利于后续的光谱分析与元素浓度定量反演。

Abstract

Designed system of coupling laser plasma emission light into optical fiber can improve efficiency of coupling plasma emission light into optical fiber and decrease system size simultaneously, which can provide hardware basis for the application of laser induced breakdown spectroscopy (LIBS) to fast, field, in-situ material composition analysis. The coupling system consists of three lenses. The first single lens is used to collimate the light emitted from plasma and the reversed telephoto consisting of the other two lenses is used to couple the collimated light into optical fiber. Coupling efficiencies of the system are all above 92% at the analysis wavelengths of Pb, Cu, Ni, Cr and Cd. The diameter of the system aperture is less than 6mm and the total length of the system is less than 30 mm. The coupling system is used to detect Cr in soil and Pb in sludge from a lead battery factory, which is compared with the methods of using double lenses collecting system and using fiber only. It is proved that the characteristic spectral lines obtained by coupling system could be more obvious and easier to recognize, limits of the detection of elements would be lower and the spectral datum could be more stable, which could be in favor of subsequent spectral lines analysis and the concentration computations of elements.

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王寅, 赵南京, 刘文清, 余洋, 方丽, 孟德硕, 胡丽, 谷艳红, 王园园, 马明俊, 肖雪, 王煜, 刘建国. 激光等离子体发射光光纤耦合系统设计与实验分析[J]. 中国激光, 2015, 42(5): 0516002. Wang Yin, Zhao Nanjing, Liu Wenqing, Yu Yang, Fang Li, Meng Deshuo, Hu Li, Gu Yanhong, Wang Yuanyuan, Ma Mingjun, Xiao Xue, Wang Yu, Liu Jianguo. Design and Experimental Analysis of the System of Coupling Laser Plasma Emission Light into Optical Fiber[J]. Chinese Journal of Lasers, 2015, 42(5): 0516002.

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