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Some Comparisons of LIBS Measurements using Nanosecond and Picosecond Laser Pulses

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Abstract:

Laser-induced breakdown spectra were measured by using a 1.3 ps laser pulse on glass, steel, and copper. Material ablation with the use of picosecond excitation is very precise with well-formed sharpedged craters. The spectra obtained with 570 nm, 1.3 ps excitation decay more quickly and show significantly lower background emission than those that use 1064 nm, ∼7 ns excitation. The background was low enough that excellent laser-induced spectroscopy (LIBS) spectra were obtained on the three samples by using a single 1.3 ps laser pulse and a nongated detector. Similar results were obtained by using nanosecond excitation but with higher relative background signals. The radiance was similar with the use of pico- or nanosecond excitation; however, the radiant intensity was larger with nanosecond excitation because of the larger plasma.

Keywords: LASER ABLATION; LASER-INDUCED BREAKDOWN SPECTROSCOPY; LASER-INDUCED PLASMAS; LIBS; LIPS; PICOSECOND LIBS; SHORT PULSE LIBS; ULTRAFAST LASER

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011951894

Affiliations: Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina 29208.

Publication date: March 1, 2001

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