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Proceedings Paper

Ablation threshold and plasma analyses in the PLD process
Author(s): Ileana Apostol; Razvan Stoian; C. Luculescu; Razvan V. Dabu; Aurel Stratan
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Paper Abstract

UV laser induced ablation of YBCO superconducting targets was studied in the initial and late evolution stages in order to control and optimize the thin film deposition process. The optimum irradiation energy was estimated using an acoustic method allowing ablation threshold and congruent ablation threshold estimation. The ablation threshold dependence on incident laser spot area and target density was studied also and recommends that the proper fluence has to be considered as a function of specific irradiation conditions. Plasma expansion analyses was performed in order to estimate the parameters that control the composition and energy of the ablated particles. Temporal and spatial resolved spectra were recorded and evidenced a high density of ionized species in the initial expansion stages, atomic emission being significant at late stages or in colder regions of the plume, where the oxide emission becomes also notable. Also a supplementary IR laser radiation focused in front of the plume for IR oxygen dissociation evidenced the oxidation enhancement at the interaction of the dissociation front with the plume species.

Paper Details

Date Published: 26 May 1998
PDF: 5 pages
Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); doi: 10.1117/12.308623
Show Author Affiliations
Ileana Apostol, National Institute for Laser, Plasma and Radiation Physics (Romania)
Razvan Stoian, National Institute for Laser, Plasma and Radiation Physics (Germany)
C. Luculescu, National Institute for Laser, Plasma and Radiation Physics (Romania)
Razvan V. Dabu, National Institute for Laser, Plasma and Radiation Physics (Romania)
Aurel Stratan, National Institute for Laser, Plasma and Radiation Physics (Romania)


Published in SPIE Proceedings Vol. 3404:
ALT'97 International Conference on Laser Surface Processing
Vladimir I. Pustovoy, Editor(s)

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