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样品温度和空间约束两种方法相结合对激光诱导击穿光谱的影响

于丹 孙艳 冯志书 代玉银 陈安民 金明星

于丹, 孙艳, 冯志书, 代玉银, 陈安民, 金明星. 样品温度和空间约束两种方法相结合对激光诱导击穿光谱的影响[J]. 中国光学, 2021, 14(2): 336-343. doi: 10.37188/CO.2020-0118
引用本文: 于丹, 孙艳, 冯志书, 代玉银, 陈安民, 金明星. 样品温度和空间约束两种方法相结合对激光诱导击穿光谱的影响[J]. 中国光学, 2021, 14(2): 336-343. doi: 10.37188/CO.2020-0118
YU Dan, SUN Yan, FENG Zhi-shu, DAI Yu-yin, CHEN An-min, JIN Ming-xing. Effects of the combination of sample temperature and spatial confinement on laser-induced breakdown spectroscopy[J]. Chinese Optics, 2021, 14(2): 336-343. doi: 10.37188/CO.2020-0118
Citation: YU Dan, SUN Yan, FENG Zhi-shu, DAI Yu-yin, CHEN An-min, JIN Ming-xing. Effects of the combination of sample temperature and spatial confinement on laser-induced breakdown spectroscopy[J]. Chinese Optics, 2021, 14(2): 336-343. doi: 10.37188/CO.2020-0118

样品温度和空间约束两种方法相结合对激光诱导击穿光谱的影响

doi: 10.37188/CO.2020-0118
基金项目: 国家自然科学基金资助项目(No. 11674128, No. 11674124, No. 11974138);吉林省教育厅“十三五”科学技术研究规划项目(No. JJKH20200937KJ)
详细信息
    作者简介:

    于丹:于 丹(1983—),女,吉林长春人,硕士,实验师,2006年于吉林大学物理学院获得学士学位,2014年于吉林大学原子与分子物理研究所获得硕士学位,主要从事激光诱导击穿光谱、物理实验教学等方向的研究。E-mail:61293289@qq.com

    金明星(1965—),男,吉林长春人,博士,教授,博士生导师,1991年于吉林大学原子与分子物理研究所获得博士学位,主要研究方向为强激光与原子分子相互作用的研究。E-mail:mxjin@jlu.edu.cn

  • 中图分类号: O657.3

Effects of the combination of sample temperature and spatial confinement on laser-induced breakdown spectroscopy

Funds: Supported by National Natural Science Foundation of China (No. 11674128, No. 11674124, No. 11974138); the Thirteenth Five-Year Scientific and Technological Research Project of the Education Department of Jilin Province (No. JJKH20200937KJ)
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  • 摘要: 升高样品温度和采用空间约束能提高激光诱导击穿光谱的信号强度,两种技术的结合可以进一步提高激光诱导击穿光谱的光谱强度。本文在空气环境中研究了升高样品温度和空间约束效应两种方法相结合对激光诱导击穿光谱的影响,测量了激光诱导铝等离子体的时间分辨光谱。实验结果表明:升高样品温度能增加激光诱导击穿光谱的信号强度,高温样品能耦合更多的激光能量;当圆柱形腔被用于约束等离子体时,信号强度得到了进一步提高。两个实验条件的结合对于激光诱导击穿光谱信号增强的效果明显强于单独升高样品温度或者单独采用空间约束的增强效果。单一200 °C高温下样品的Al(I) 396.2 nm线强度增加了1.4倍;单一空间约束条件下的Al(I) 396.2 nm线强度增加了1.3倍;而在200 °C和空间约束的组合条件下,Al(I) 396.2 nm线强度增加了2.1倍。这个结合效应增强效果产生主要由于激光照射高温样品产生更强的冲击波,从而能更有效地压缩高温下产生的更大尺寸的等离子体羽,进一步提高了激光诱导击穿光谱的强度。
  • 图  1  实验装置示意图(M为反射镜;I为光阑;Pd为光电二极管;DM为双色镜;L为透镜)

    Figure  1.  Schematic diagram of experimental setup (M is the mirror; I is the iris; Pd is the photodiode; DM is the dichroic mirror; L is the lens)

    图  2  不同样品温度下铝的LIBS时间积分光谱,延迟时间为6 μs,积分时间为20 μs,激光能量为40 mJ

    Figure  2.  Time-integrated spectra of aluminum plasma at different sample temperatures when the delay time is 6 μs, the integrated time is 20 μs, and the laser energy is 40 mJ

    图  3  不同样品温度下Al(I) 396.2 nm峰强度随着延迟时间的变化,门宽为0.5 μs,激光能量为40 mJ

    Figure  3.  Evolution of peak intensity of Al (I) 396.2 nm at different sample temperatures when gate width is 0.5 μs, and the laser energy is 40 mJ

    图  4  有无空间约束下不同样品温度的Al(I) 396.2 nm峰强度随着延迟时间的变化情况,门宽为0.5 μs,激光能量为40 mJ

    Figure  4.  Evolution of peak intensity of Al (I) 396.2 nm with and without space confinement as a function of delay time at different sample temperatures when gate width is 0.5 μs, and laser energy is 40 mJ

    图  5  有无空间约束下不同样品温度的Al(I) 396.2 nm信背比随着延迟时间的变化,门宽为0.5 μs,激光能量为40 mJ

    Figure  5.  Evolution of SBR of Al (I) 396.2 nm with and without space confinement as a function of delay time at different sample temperatures when gate width is 0.5 μs, and the laser energy is 40 mJ

    图  6  无(a),有(b)空间约束下不同样品温度的Al等离子体光谱对比,延迟时间为12.5 μs,门宽为0.5 μs,激光能量为40 mJ

    Figure  6.  Comparison of spectra of Al plasmas without (a) and with (b) spatial confinement at different sample temperatures, when the delay time is 12.5 μs, the gate width is 0.5 μs, and the laser energy is 40 mJ

    图  7  有无空间约束下不同样品温度Al(I) 396.2 nm峰强度对比,延迟时间为12.5 μs,门宽为0.5 μs,激光能量为40 mJ

    Figure  7.  Comparison of peak intensity of Al (I) 396.2 nm at different sample temperatures with and without space confinement when the delay time is 12.5 μs, the gate width is 0.5 μs, and the laser energy is 40 mJ

    图  8  低、高样品温度下冲击波与等离子体羽之间相互作用的示意图

    Figure  8.  Schematic diagram of the interaction between the shock wave and the plasma plume at low and high sample temperatures

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出版历程
  • 收稿日期:  2020-07-07
  • 修回日期:  2020-08-12
  • 网络出版日期:  2021-02-05
  • 刊出日期:  2021-04-01

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