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Title: Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces

Here, time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of metallic particles bound to transparent substrates. Plasma associated with Fe(I) emission lines originating from steel microspheres was observed to cool from >24,000 to ~15,000 K over ~220 ns as $$\tau$$ -0.28, consistent with radiative losses and adiabatic gas expansion of a relatively free plasma. Simultaneous emission lines from Si(II) associated with the plasma etching of the SiO2 substrate were observed yielding higher plasma temperatures, ~35,000 K, relative to the Fe(I) plasma. Lastly, the difference in species temperatures is consistent with plasma confinement at the microsphere-substrate interface as the particle is ejected, and is directly visualized using pump-probe shadowgraphy as a function of pulsed laser energy.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Florida Agriculture and Mechanical Univ., Tallahassee, FL (United States). Dept. of Physics
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-678662
Journal ID: ISSN 0146-9592; OPLEDP
Grant/Contract Number:
AC52-07NA27344; 14ERD098
Type:
Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 40; Journal Issue: 22; Journal ID: ISSN 0146-9592
Publisher:
Optical Society of America (OSA)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION; 71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1239201
Alternate Identifier(s):
OSTI ID: 1225236

Harris, Candace D., Shen, Nan, Rubenchik, Alexander M., Demos, Stavros G., and Matthews, Manyalibo J.. Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces. United States: N. p., Web. doi:10.1364/OL.40.005212.
Harris, Candace D., Shen, Nan, Rubenchik, Alexander M., Demos, Stavros G., & Matthews, Manyalibo J.. Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces. United States. doi:10.1364/OL.40.005212.
Harris, Candace D., Shen, Nan, Rubenchik, Alexander M., Demos, Stavros G., and Matthews, Manyalibo J.. 2015. "Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces". United States. doi:10.1364/OL.40.005212. https://www.osti.gov/servlets/purl/1239201.
@article{osti_1239201,
title = {Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces},
author = {Harris, Candace D. and Shen, Nan and Rubenchik, Alexander M. and Demos, Stavros G. and Matthews, Manyalibo J.},
abstractNote = {Here, time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of metallic particles bound to transparent substrates. Plasma associated with Fe(I) emission lines originating from steel microspheres was observed to cool from >24,000 to ~15,000 K over ~220 ns as $\tau$-0.28, consistent with radiative losses and adiabatic gas expansion of a relatively free plasma. Simultaneous emission lines from Si(II) associated with the plasma etching of the SiO2 substrate were observed yielding higher plasma temperatures, ~35,000 K, relative to the Fe(I) plasma. Lastly, the difference in species temperatures is consistent with plasma confinement at the microsphere-substrate interface as the particle is ejected, and is directly visualized using pump-probe shadowgraphy as a function of pulsed laser energy.},
doi = {10.1364/OL.40.005212},
journal = {Optics Letters},
number = 22,
volume = 40,
place = {United States},
year = {2015},
month = {11}
}