Time-resolved dual-comb measurement of number density and temperature in a laser-induced plasma

Zhang, Yu; Lecaplain, Caroline; Weeks, Reagan R.; Yeak, Jeremy; Harilal, Sivanandan S.; Phillips, Mark C.; Jones, R Jason

doi:10.1364/OL.44.003458

Title: Time-resolved dual-comb measurement of number density and temperature in a laser-induced plasma

Journal Article · Wed Jul 10 00:00:00 EDT 2019 · Optics Letters

DOI:https://doi.org/10.1364/OL.44.003458· OSTI ID:1568056

Zhang, Yu ^[1]; Lecaplain, Caroline ^[1]; Weeks, Reagan R. ^[1]; Yeak, Jeremy ^[2];

^[3]; Phillips, Mark C. ^[3]; Jones, R Jason ^[1]

University of Arizona
Opticslah, Inc.
BATTELLE (PACIFIC NW LAB)

We demonstrate time-resolved dual-comb spectroscopy of a laser-induced plasma and characterize the temporal evolution of the absorption excitation temperature and population number density for multiple Fe transitions. The spectrum of three excited-state transitions of Fe around 533 nm are simultaneously detected at different time delays following laser ablation of a stainless steel sample. This work probes late-time behavior of laser-induced ablation plumes during plasma cooling, significant for revealing important information on molecule and particle formation. The high spectral resolution and broadband capability of the dual-comb technique, combined with time-resolved measurement capability, will aid in characterization of plasma properties, species identification, and higher resolution spectroscopy including isotopic analysis.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1568056

Report Number(s):: PNNL-SA-141772

Journal Information:: Optics Letters, Vol. 44, Issue 14

Country of Publication:: United States

Language:: English

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