Journal
JOURNAL OF APPLIED PHYSICS
Volume 130, Issue 20, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0065240
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Funding
- Department of Energy (DOE)/NNSA Office of Defense Nuclear Nonproliferation Research and Development (DNN RD)
- U.S. Department of Energy [DE-AC05-76RL01830]
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In this study, laser-induced fluorescence (LIF) was utilized to enhance emission signals from plasma generated by ultrafast laser filaments on an Al 6061 alloy target. This approach effectively reduced self-reversal features and improved detection sensitivity for standoff and remote element and isotope detection. The findings highlight the potential of LIF for boosting signal-to-noise ratio in filament-induced breakdown spectroscopy applications.
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, 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.
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