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Thomson scattering from laser-induced plasma in atmospheric helium was used to obtain temporally and spatially resolved electron temperature and density profiles. Electron density measurements at 5 μs after breakdown are compared with those derived from the separation of the allowed and forbidden components of the 447.1 nm He I line. Plasma is created using 9 ns, 140 mJ pulses from Nd:YAG laser at 1064 nm. Electron densities of ∼5 × 1016 cm-3 are in good agreement with Thomson scattering measurements, benchmarking this emission line as a useful diagnostic for high density plasmas.
Published in:
Applied Physics Letters
(Volume:99
,
Issue:
26
)
Date of Publication: Dec 2011
- Page(s):
- 261504 - 261504-3
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.3672817
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 02 January 2012
- Issue Date :
- Dec 2011
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