4 April 2008 Characterization of near-infrared low energy ultra-short laser pulses for portable applications of laser induced breakdown spectroscopy
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Abstract
We report on the delivery of low energy ultra-short (<1 ps) laser pulses for laser induced breakdown spectroscopy (LIBS). Ultra-short pulses have the advantage of high peak irradiance even at very low pulse energies. This opens the possibility to use compact, rare-earth doped fiber lasers in a portable platform for point detection applications using LIBS for elemental analysis. The use of low energy ultra-short pulses minimizes the generation of a broad continuum background in the emission spectrum, which permits the use of non-gated detection schemes using very simple and compact spectrometers rather than large and delicate intensified charge-coupled devices (ICCDs). The pulse energies used to produce high-quality LIBS spectra in this investigation are some of the lowest reported and we investigate the threshold pulse requirements for a number of near IR pulse wavelengths (785-1500 nm) and observe that the pulse wavelength has no effects on the threshold for observation of plasma emission or the quality of the emission spectra obtained.
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Paul M. Pellegrino, Alexander W. Schill, Dimitra N. Stratis-Cullum, "Characterization of near-infrared low energy ultra-short laser pulses for portable applications of laser induced breakdown spectroscopy", Proc. SPIE 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX, 695408 (4 April 2008); doi: 10.1117/12.781556; https://doi.org/10.1117/12.781556
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