Assessment of suitability of diode pumped solid state lasers for laser induced breakdown and Raman spectroscopy
| Autor: | Marek Hoehse, Ulrich Panne, Igor B. Gornushkin, Sven Merk |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | J. Anal. At. Spectrom.. 26:414-424 |
| ISSN: | 1364-5544 0267-9477 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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