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Proceedings Paper

Investigation of double-pulse femtosecond laser induced breakdown spectroscopy of polymethyl methacrylate (PMMA)
Author(s): Mengmeng Wang; Sumei Wang; Zhitao Cao; Peng Wang; Cong Wang
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Paper Abstract

The emission properties of double-pulse (DP) over single-pulse (SP) femtosecond laser breakdown spectroscopy (fs- LIBS) of polymethyl methacrylate (PMMA) were investigated. The signal enhancements in the DP fs-LIBS strongly depended on the DP delay and were influenced by the type of emission particles. Intensity enhancement of emission lines increased in the sequence of molecules, neutral atoms, and ions. Electron density and temperature were reported to characterize the plasmas. Both the electron density and plasma temperature exhibit similar variation trajectories with respect to the DP delay and feature a distinct increase at an optimal DP delay of ~80 ps, indicating reheating of preproduced plume is responsible for the emission enhancement. The dependence of the signal emission on laser energy was also studied, showing the emission intensity was linear to the pulse energy. However, the signal enhancement was nonlinear to the pulse energy, suggesting that the signal enhancement was related to the energy coupling efficiency of second pulse to the first pulse generated plume.

Paper Details

Date Published: 12 March 2015
PDF: 11 pages
Proc. SPIE 9351, Laser-based Micro- and Nanoprocessing IX, 93511Q (12 March 2015); doi: 10.1117/12.2077452
Show Author Affiliations
Mengmeng Wang, Beijing Institute of Technology (China)
Univ. of Nebraska-Lincoln (United States)
Sumei Wang, Beijing Institute of Technology (China)
Zhitao Cao, Beijing Institute of Technology (China)
Peng Wang, Beijing Institute of Technology (China)
Cong Wang, Central South Univ. (China)

Published in SPIE Proceedings Vol. 9351:
Laser-based Micro- and Nanoprocessing IX
Udo Klotzbach; Kunihiko Washio; Craig B. Arnold, Editor(s)

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