Heat transfer and propagation of plumes in laser reactive ablation of a Ti target in low-pressure N2

Johny Neamtu; Ion N. Mihailescu; Carmen Ristoscu; Cristian Sarpe-Tudoran

doi:10.1117/12.347647

7 May 1999 Heat transfer and propagation of plumes in laser reactive ablation of a Ti target in low-pressure N₂

Johny Neamtu, Ion N. Mihailescu, Carmen Ristoscu, Cristian Sarpe-Tudoran

Proceedings Volume 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications; (1999) https://doi.org/10.1117/12.347647
Event: 10th International School on Quantum Electronics: Lasers: Physics and Applications, 1998, Varna, Bulgaria

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.

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Johny Neamtu, Ion N. Mihailescu, Carmen Ristoscu, and Cristian Sarpe-Tudoran "Heat transfer and propagation of plumes in laser reactive ablation of a Ti target in low-pressure N₂", Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); https://doi.org/10.1117/12.347647

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