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Issue 2, 2011
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Assessment of suitability of diode pumped solid state lasers for laser induced breakdown and Raman spectroscopy

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Abstract

The potential of a diode pumped solid state (DPSS) laser for laser induced breakdown spectroscopy (LIBS) and Raman spectroscopy was investigated. The DPSS laser operating at repetition rates of 1 Hz–200 kHz, pulse energy of ∼1 mJ, and pulse duration of ∼20 ns was added to a conventional LIBS system equipped with the flashlamp-pumped Nd:YAG laser (10 Hz, 400 mJ, 6 ns) to directly compare the two laser systems. Despite the lower mass ablated per laser pulse (∼several nanograms) and a weaker plasma, the total mass ablated per measurement interval (∼1 s) and total emission signal were significantly higher than those obtained with the flashlamp pumped Nd:YAG laser. This resulted in the improved signal-to-noise ratio and better limits of detection (LOD). The best LODs were obtained for Cu, Cr and Ni in ultrapure standard iron samples, 0.7 ppm, 1 ppm and 5 ppm, correspondingly. The plasma from the DPSS laser was characterized in terms of its radiative properties, temperature, and shockwave propagation speed. The suitability of this laser for LIBS-Raman was demonstrated by mapping the elemental and molecular composition of a mineral sample. The results strongly imply that DPSS lasers are the promising source for LIBS, Raman, or combined LIBS-Raman spectroscopy.

Graphical abstract: Assessment of suitability of diode pumped solid state lasers for laser induced breakdown and Raman spectroscopy

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Article information


Submitted
01 Jun 2010
Accepted
08 Nov 2010
First published
02 Dec 2010

J. Anal. At. Spectrom., 2011,26, 414-424
Article type
Paper

Assessment of suitability of diode pumped solid state lasers for laser induced breakdown and Raman spectroscopy

M. Hoehse, I. Gornushkin, S. Merk and U. Panne, J. Anal. At. Spectrom., 2011, 26, 414
DOI: 10.1039/C0JA00038H

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