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Proceedings Paper

Heat transfer and propagation of plumes in laser reactive ablation of a Ti target in low-pressure N2
Author(s): Johny Neamtu; Ion N. Mihailescu; Carmen Ristoscu; Cristian Sarpe-Tudoran
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Paper Abstract

We have studied the thermal phenomena implied in the interaction process between the high intensity UV laser radiation and bulk targets. A numerical model for simulating laser-solid interactions has been developed. The phenomena occurring in the target are described by solving the 1D heat equation under conditions of normal vaporization. The calculus was conducted for the case of a Ti and Al targets submitted to a multipulse UV laser irradiation in low pressure nitrogen. In order to elucidate the origin of the droplets, we performed a numerical evaluation of the spatial distribution of temperature reached in the subsurface region. We also analyzed the transit through gas of the ablated atoms and/or of the newly-formed chemical compounds in the case of the ablation of a Ti target in low pressure N2. This transit was approached with a Monte-Carlo method. We performed Monte Carlo simulations to determine the energy distribution of the atoms and/or of the new chemical compounds at different distances (1.5 - 3) cm from the target surface. The calculation of the energy at which the atoms reach the substrate permits the investigation of the synthesis of TiN and allows the optimum determination of target-collector separation distance. The results we obtained are in reasonable agreement with the experimental determinations.

Paper Details

Date Published: 7 May 1999
PDF: 5 pages
Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); doi: 10.1117/12.347647
Show Author Affiliations
Johny Neamtu, Univ. Craiova (Romania)
Ion N. Mihailescu, Institute of Atomic Physics (Romania)
Carmen Ristoscu, Institute of Atomic Physics (Romania)
Cristian Sarpe-Tudoran, Univ. Craiova (Romania)

Published in SPIE Proceedings Vol. 3571:
Tenth International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Dimitar V. Stoyanov, Editor(s)

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