Laser-induced fluorescence of filament-produced plasmas
Abstract
Self-guided ultrafast laser filaments are a promising method for laser beam delivery and plasma generation for standoff and remote detection of elements and isotopes via filament-induced breakdown spectroscopy (FIBS). Yet, there are several challenges associated with the practical application of FIBS, including delivery of sufficient laser energy at the target for generating plasma with a copious amount of emission signals for obtaining a high signal-to-noise ratio. Here, in this study, we use laser-induced fluorescence (LIF) to boost the emission signal and reduce self-reversal in the spectral profiles. Ultrafast laser filaments were used to produce plasmas from an Al 6061 alloy target at various standoff distances from 1 to 10 m. For LIF emission enhancement, a narrow linewidth continuous-wave laser was used in resonance with a 394.40 nm Al I resonant transition, and the emission signal was monitored from the directly coupled transition at 396.15 nm. Emission signal features of Al I are significantly enhanced by resonant excitation. In addition, LIF of filament ablation plumes reduces the self-reversal features seen in the thermally excited spectral profiles. Time-resolved two-dimensional fluorescence spectroscopy was performed for evaluating the optical saturation effects, which are found to be non-negligible due to high Al atomic densities inmore »
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Univ. of Arizona, Tucson, AZ (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- OSTI Identifier:
- 1906969
- Alternate Identifier(s):
- OSTI ID: 1832250
- Report Number(s):
- PNNL-SA-164939
Journal ID: ISSN 0021-8979; TRN: US2311857
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 130; Journal Issue: 20; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; optical sensing; plasma diagnostics; ultrafast laser filament ablation; optical properties; emission spectroscopy; ultrafast lasers; atomic spectral lines; laser induced fluorescence; plasma sources; plasma properties and parameters; fluorescence spectroscopy; femtosecond lasers
Citation Formats
Kautz, Elizabeth J., Phillips, Mark C., and Harilal, Sivanandan S. Laser-induced fluorescence of filament-produced plasmas. United States: N. p., 2021.
Web. doi:10.1063/5.0065240.
Kautz, Elizabeth J., Phillips, Mark C., & Harilal, Sivanandan S. Laser-induced fluorescence of filament-produced plasmas. United States. https://doi.org/10.1063/5.0065240
Kautz, Elizabeth J., Phillips, Mark C., and Harilal, Sivanandan S. Tue .
"Laser-induced fluorescence of filament-produced plasmas". United States. https://doi.org/10.1063/5.0065240. https://www.osti.gov/servlets/purl/1906969.
@article{osti_1906969,
title = {Laser-induced fluorescence of filament-produced plasmas},
author = {Kautz, Elizabeth J. and Phillips, Mark C. and Harilal, Sivanandan S.},
abstractNote = {Self-guided ultrafast laser filaments are a promising method for laser beam delivery and plasma generation for standoff and remote detection of elements and isotopes via filament-induced breakdown spectroscopy (FIBS). Yet, there are several challenges associated with the practical application of FIBS, including delivery of sufficient laser energy at the target for generating plasma with a copious amount of emission signals for obtaining a high signal-to-noise ratio. Here, in this study, we use laser-induced fluorescence (LIF) to boost the emission signal and reduce self-reversal in the spectral profiles. Ultrafast laser filaments were used to produce plasmas from an Al 6061 alloy target at various standoff distances from 1 to 10 m. For LIF emission enhancement, a narrow linewidth continuous-wave laser was used in resonance with a 394.40 nm Al I resonant transition, and the emission signal was monitored from the directly coupled transition at 396.15 nm. Emission signal features of Al I are significantly enhanced by resonant excitation. In addition, LIF of filament ablation plumes reduces the self-reversal features seen in the thermally excited spectral profiles. Time-resolved two-dimensional fluorescence spectroscopy was performed for evaluating the optical saturation effects, which are found to be non-negligible due to high Al atomic densities in the filament-produced plasmas.},
doi = {10.1063/5.0065240},
journal = {Journal of Applied Physics},
number = 20,
volume = 130,
place = {United States},
year = {Tue Nov 23 00:00:00 EST 2021},
month = {Tue Nov 23 00:00:00 EST 2021}
}
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