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Proceedings Paper

Spectroscopic study of the plasmas generated by nanosecond laser ablation of Er3+-doped Ti:LiNbO3 targets
Author(s): M. Stafe; C. Negutu; I. Vladoiu; S. S. Ciobanu; B. Savu; N. N. Puscas
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Paper Abstract

This paper presents an experimental study of the ablation-plasmas and of the craters generated by focusing visible nanosecond laser pulses at normal incidence on a solid target of Er3+-doped Ti:LiNbO3, in atmospheric air. The laser irradiance was varied in the range of 0.25 to 2.5 TW/cm2, which is close to the plume-ignition threshold. The spatial variation of the neutral Li lines and of the temperature along the axial direction within the plasma plume was evaluated by scanning axially the plume image with a fiber that is coupled at the spectrometer entrance. The results indicate that the intensity of the neutral Li lines increases when increasing the distance from the target's surface. The plasma temperature calculated by accounting for these lines intensities is almost constant (~14000 K) being non-dependent on laser-irradiance and distance from the target. The spectroscopic study is augmented with an optical microscopy study of the ablated craters in order to determine the correlation between the ablation rate in multi-pulse regime and the plasma spectrum. The results indicate that monitoring the plasma spectrum at a fixed position above the target surface the lines intensity decrease with pulse number, probably due to the confinement of the plume into the deep crater that are drilled in multi-pulse regime.

Paper Details

Date Published: 17 May 2010
PDF: 4 pages
Proc. SPIE 7469, ROMOPTO 2009: Ninth Conference on Optics: Micro- to Nanophotonics II, 746907 (17 May 2010); doi: 10.1117/12.858813
Show Author Affiliations
M. Stafe, Polytechnical Univ. of Bucharest (Romania)
C. Negutu, Polytechnical Univ. of Bucharest (Romania)
I. Vladoiu, Polytechnical Univ. of Bucharest (Romania)
S. S. Ciobanu, Polytechnical Univ. of Bucharest (Romania)
B. Savu, Polytechnical Univ. of Bucharest (Romania)
N. N. Puscas, Polytechnical Univ. of Bucharest (Romania)


Published in SPIE Proceedings Vol. 7469:
ROMOPTO 2009: Ninth Conference on Optics: Micro- to Nanophotonics II
Valentin I. Vlad, Editor(s)

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