Abstract
Laser-induced plasma was produced on preheated (up to 500 °C) aluminum targets in air with a nanosecond-pulsed Nd:YAG laser emitting at 1064 nm. Plasma was generated for laser pulse energies ranging from 60 to 800 mJ and the spatially and time-integrated emission was collected as the sample temperature was increased. Electron temperature was found to be independent of the experimental conditions, while the electron density had a weak dependence on the pulse energy and target temperature. Emission enhancement increased with both varied parameters, although with a tendency to saturation for high-energy and high-temperature regimes. A simple model predicting the ablated volume is discussed in terms of the experimental results.
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Acknowledgments
This work was supported by the National Autonomous University of Mexico (DGAPA-UNAM: IN101212) and the National Council of Science and Technology of Mexico (CONACyT 102364-F). R Sanginés acknowledges the DGAPA- UNAM Postdoctoral fellowship. The authors acknowledge K. Jiménez-Durán who performed the microscopy measurements.
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Sanginés, R., Sobral, H. & Alvarez-Zauco, E. Emission enhancement in laser-produced plasmas on preheated targets. Appl. Phys. B 108, 867–873 (2012). https://doi.org/10.1007/s00340-012-5130-6
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DOI: https://doi.org/10.1007/s00340-012-5130-6