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

Journal Article · · Optics Letters
DOI:https://doi.org/10.1364/OL.40.005212· OSTI ID:1239201
 [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)

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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-07NA27344; 14ERD098
OSTI ID:
1239201
Alternate ID(s):
OSTI ID: 1225236
Report Number(s):
LLNL-JRNL-678662; OPLEDP
Journal Information:
Optics Letters, Vol. 40, Issue 22; ISSN 0146-9592
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (1)

Detaching and moving of adhered particles with a photoacoustic micro-resonator journal February 2019