Optical emission from ultrafast laser filament-produced air plasmas in the multiple filament regime
Abstract
We perform optical emission spectroscopy of ultrafast laser filament-produced air plasmas in the multiple filament regime at driving wavelengths of 400 nm and 800 nm. The spatiotemporal structure of the emission from the plasmas are observed and the emission spectra are used to estimate plasma temperature and density for a range of laser parameters. Plasma temperatures are determined from the molecular nitrogen fluorescence, while the electron densities are estimated from Stark broadening of the oxygen-I 777.19-nm line. Electron temperatures are determined to be in the range of 5000–5200 K and they do not vary significantly along the length of the filament, nor are they sensitive to incident laser energy or wavelength. Electron densities are on order of 1016 cm-3 and show a greater variation with axial position, laser energy, and laser wavelength. We discuss mechanisms responsible for spatial localization of emitting species within the filament. Optical emission spectroscopy offers a simple, non-perturbing method to measure filament properties, that allows the information on the associated molecular transitions and excitation/ionization mechanisms to be extracted.
- Publication Date:
- Research Org.:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1478696
- Alternate Identifier(s):
- OSTI ID: 1524438
- Grant/Contract Number:
- NA0002534
- Resource Type:
- Published Article
- Journal Name:
- Optics Express
- Additional Journal Information:
- Journal Name: Optics Express Journal Volume: 26 Journal Issue: 22; Journal ID: ISSN 1094-4087
- Publisher:
- Optical Society of America (OSA)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Finney, L. A., Skrodzki, P. J., Burger, M., Xiao, X., Nees, J., and Jovanovic, I. Optical emission from ultrafast laser filament-produced air plasmas in the multiple filament regime. United States: N. p., 2018.
Web. doi:10.1364/OE.26.029110.
Finney, L. A., Skrodzki, P. J., Burger, M., Xiao, X., Nees, J., & Jovanovic, I. Optical emission from ultrafast laser filament-produced air plasmas in the multiple filament regime. United States. https://doi.org/10.1364/OE.26.029110
Finney, L. A., Skrodzki, P. J., Burger, M., Xiao, X., Nees, J., and Jovanovic, I. Wed .
"Optical emission from ultrafast laser filament-produced air plasmas in the multiple filament regime". United States. https://doi.org/10.1364/OE.26.029110.
@article{osti_1478696,
title = {Optical emission from ultrafast laser filament-produced air plasmas in the multiple filament regime},
author = {Finney, L. A. and Skrodzki, P. J. and Burger, M. and Xiao, X. and Nees, J. and Jovanovic, I.},
abstractNote = {We perform optical emission spectroscopy of ultrafast laser filament-produced air plasmas in the multiple filament regime at driving wavelengths of 400 nm and 800 nm. The spatiotemporal structure of the emission from the plasmas are observed and the emission spectra are used to estimate plasma temperature and density for a range of laser parameters. Plasma temperatures are determined from the molecular nitrogen fluorescence, while the electron densities are estimated from Stark broadening of the oxygen-I 777.19-nm line. Electron temperatures are determined to be in the range of 5000–5200 K and they do not vary significantly along the length of the filament, nor are they sensitive to incident laser energy or wavelength. Electron densities are on order of 1016 cm-3 and show a greater variation with axial position, laser energy, and laser wavelength. We discuss mechanisms responsible for spatial localization of emitting species within the filament. Optical emission spectroscopy offers a simple, non-perturbing method to measure filament properties, that allows the information on the associated molecular transitions and excitation/ionization mechanisms to be extracted.},
doi = {10.1364/OE.26.029110},
journal = {Optics Express},
number = 22,
volume = 26,
place = {United States},
year = {Wed Oct 24 00:00:00 EDT 2018},
month = {Wed Oct 24 00:00:00 EDT 2018}
}
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https://doi.org/10.1364/OE.26.029110
https://doi.org/10.1364/OE.26.029110
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Cited by: 6 works
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Figures / Tables:
Fig. 1: Schematic of the experimental setup. The inset image shows an example radial profile of the multiple filament cores (bright spots) observed from the damage on a copper target (3 mJ, 400 nm). The copper target is placed near the geometric focus of the spherical mirror.
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.