Detection limits for laser absorption spectroscopy of Li in laser ablation plumes

Phillips, Mark C.; Kautz, Elizabeth J.; Harilal, Sivanandan S.

doi:10.1364/ol.564323

Detection limits for laser absorption spectroscopy of Li in laser ablation plumes

Journal Article · Fri May 09 00:00:00 EDT 2025 · Optics Letters

DOI:https://doi.org/10.1364/ol.564323· OSTI ID:2560792

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University of Arizona, Tucson, AZ (United States)
North Carolina State University, Raleigh, NC (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Washington State University, Pullman, WA (United States)

A high-sensitivity laser absorption spectroscopy (LAS) method is demonstrated for rapid and non-contact analysis of Li in solids. Glass samples with Li concentrations ranging from 1-500 ppm by mass are ablated in 5 Torr air, and time-resolved Li atomic absorption is measured using a tunable laser near 671 nm. Significant improvements in analytical performance over prior laser-induced breakdown techniques are demonstrated. Here, a single-shot limit of detection (LOD) of 180 ppb is shown for fixed wavelength operation, improving to 6 ppb with averaging over 1000 ablation shots (100 s acquisition time). Isotope-resolved Li absorption spectra are measured with a 17 ppb LOD in 40 s. Methods for optimizing LOD based on noise/averaging properties of LAS experiments in LA plumes are discussed.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Security; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-76RL01830; NA0004142

OSTI ID:: 2560792

Alternate ID(s):: OSTI ID: 2565058
OSTI ID: 3008632

Report Number(s):: PNNL-SA--207912

Journal Information:: Optics Letters, Journal Name: Optics Letters Journal Issue: 10 Vol. 50; ISSN 1539-4794; ISSN 0146-9592

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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