Laser-Induced Breakdown Spectroscopy Analysis of Solids Using a Long-Pulse (150 ns) Q-switched Nd:YAG Laser

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Abstract:

Laser-induced breakdown spectroscopy (LIBS) measurements are typically carried out using pulses (<20 ns, >50 mJ) from a flashlamp-pumped electro-optically Q-switched Nd:YAG laser (EO-laser) or excimer laser. Here we report LIBS analyses of solids using an acousto-optically Q-switched Nd:YAG laser (AO-laser) producing 150 ns pulses of lower energy (10 mJ) at repetition rates up to 6 kHz. The high repetition rate allows increased spatial or depth sampling over a given time period compared to the EO-laser. Results of AO-laser based LIBS analysis of (1) steels, (2) soils, and (3) surface stains and dusts are described. Detection limits for Cr, Cu, Mn, Ni, and Si in steel ranged from 0.11 to 0.24% using a commercial polychromator-based detection system with limits 4–30 times lower achieved using a laboratory-based detection system. The minimum detectable masses of Ba, Cr, Mn, and Sr on a metal surface were estimated with 1.2 pg/shot achieved for Sr. Detection limits for Ba and Sr in soil were 296 and 52 ppm, respectively. The temperatures, spectra, and emission decay curves from plasmas generated by the AO- and EO-lasers are compared and some characteristics of particles ablated by the AO-laser are described.

Keywords: ACOUSTO-OPTICALLY Q-SWITCHED ND:YAG LASER; LASER SPARK; LASER-INDUCED BREAKDOWN SPECTROSCOPY; LIBS; LONG PULSE LASER

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702055012672

Affiliations: Group C-ADI, MS J565, Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (K.Y.Y., L.E.F., M.P.D.); Applied Research Associates, Inc., 4300 San Mateo Blvd. NE, Albuquerque, New Mexico 87110 (D.A.C.); and Group EES-2, MS J495, Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (R.D.H.)

Publication date: September 1, 2005

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