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The importance of longer wavelength reheating in dual-pulse laser-induced breakdown spectroscopy

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Abstract

Dual-pulse laser-induced breakdown spectroscopy (LIBS) provides improved sensitivity compared to conventional single-pulse LIBS. We used a combination of Nd: yttrium aluminum garnet (YAG) and CO2 lasers to improve the sensitivity of LIBS. Significant emission intensity enhancement is noticed for both excited neutral lines and ionic lines for dual-pulse LIBS compared to single-pulse LIBS. However, the enhancement factor is found to be dependend on the energy levels of the lines, and resonance lines provided maximum enhancement. Our results indicate that IR reheating will cause significant improvement in sensitivity, regardless of the conditions, even with an unfocused reheating beam. The improved sensitivity with a YAG-CO2 laser combination is caused by the effective reheating of the pre-plume with a longer wavelength laser is due to efficient inverse Bremsstrahlung absorption. The role of the spot sizes, inter-pulse delay times, energies of the preheating and reheating pulses on the LIBS sensitivity improvements are discussed.

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Acknowledgements

This work was supported by the Department of Energy National Nuclear Security Administration under Award number DE-NA0001174.

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Authors and Affiliations

  1. School of Nuclear Engineering, and Center for Materials Under Extreme Environment, Purdue University, West Lafayette, IN, 47907, USA

    R. W. Coons, S. S. Harilal, S. M. Hassan & A. Hassanein

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  1. R. W. Coons
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  2. S. S. Harilal
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  3. S. M. Hassan
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  4. A. Hassanein
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Correspondence to R. W. Coons.

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Coons, R.W., Harilal, S.S., Hassan, S.M. et al. The importance of longer wavelength reheating in dual-pulse laser-induced breakdown spectroscopy. Appl. Phys. B 107, 873–880 (2012). https://doi.org/10.1007/s00340-012-4997-6

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  • DOI: https://doi.org/10.1007/s00340-012-4997-6

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