中国物理B ›› 2006, Vol. 15 ›› Issue (10): 2271-2274.doi: 10.1088/1009-1963/15/10/015

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Time-resolved measurement of atomic emission enhancement by fs--ns dual-pulsed laser-induced breakdown spectroscopy

程建平1, 吕　敏1, 颜立新2, 张永生3, 郑国鑫3, 刘晶儒3   

  1. (1)epartment of Engineering Physics, Tsinghua University,Beijing 100084, China; (2)epartment of Engineering Physics, Tsinghua University,Beijing 100084, China Northwest Institute of Nuclear Technology, PO Box 69 26, Xi'an 710024, China; (3)Northwest Institute of Nuclear Technology, PO Box 69 26, Xi'an 710024, China
  • 收稿日期:2005-12-06 修回日期:2006-06-07 出版日期:2006-10-20 发布日期:2006-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10474081).

Time-resolved measurement of atomic emission enhancement by fs--ns dual-pulsed laser-induced breakdown spectroscopy

Yan Li-Xin(颜立新)a)b)†, Zhang Yong-Sheng(张永生)b), Zheng Guo-Xin(郑国鑫)b), Liu Jing-Ru(刘晶儒)b), Cheng Jian-Ping(程建平)a), and Lü Min(吕敏)a)   

  1. a Department of Engineering Physics, Tsinghua University, Beijing 100084, China; b Northwest Institute of Nuclear Technology, PO Box 69 26, Xi'an 710024, China
  • Received:2005-12-06 Revised:2006-06-07 Online:2006-10-20 Published:2006-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10474081).

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摘要： Time-resolved measurement of atomic emission enhancement is performed by using a 500-fs KrF laser pulse incident upon a high density supersonic O_{2} gas jet, synchronized with an orthogonal ns frequency-doubled Nd:YAG laser pulse. The ultra-short pulse serves as an igniter of the gas jet, and the subsequent ns-laser pulse significantly enhances the atomic emission. Analysis shows that the contributions to the enhancement effect are made mainly by the bremsstrahlung radiation and cascade ionization.

关键词: time-resolved measurement, atomic emission enhancement, dual-pulse LIBS

Abstract: Time-resolved measurement of atomic emission enhancement is performed by using a 500-fs KrF laser pulse incident upon a high density supersonic O2 gas jet, synchronized with an orthogonal ns frequency-doubled Nd:YAG laser pulse. The ultra-short pulse serves as an igniter of the gas jet, and the subsequent ns-laser pulse significantly enhances the atomic emission. Analysis shows that the contributions to the enhancement effect are made mainly by the bremsstrahlung radiation and cascade ionization.

Key words: time-resolved measurement, atomic emission enhancement, dual-pulse LIBS

中图分类号:  (Spectroscopy of solid state dynamics)

  • 78.47.-p