Journal
OPTICS LETTERS
Volume 44, Issue 14, Pages 3458-3461Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.003458
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0091]
- Defense Threat Reduction Agency (DTRA) [11710030]
- National Science Foundation (NSF) [1206555]
- Office of Defense Nuclear Nonproliferation (DNN)
- National Nuclear Security Administration (NNSA)
- U.S. Department of Energy (DOE) [DE-AC05-76RL01830]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1206555] Funding Source: National Science Foundation
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We utilize time-resolved dual-comb spectroscopy to measure the temporal evolution of the population number densities and absorption excitation temperature of Fe in a laser-induced plasma. The spectra of three excited-state transitions of Fe around 533 nm are simultaneously measured at different time delays following laser ablation of a stainless steel sample. This Letter probes late-time behaviors of laser-induced ablation plumes during plasma cooling. The high spectral resolution and broad spectral coverage of the dual-comb technique, combined with the time-resolved measurement capability shown here, will aid in the characterization of laser induced plasmas, including species identification and molecule and particle formation that can occur at later times in the plasma evolution. (C) 2019 Optical Society of America
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