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Characterization of the laser-ablation plasmas using optical spectroscopy and opto-acoustic methods

C. NEGUTU1, M. STAFE1, S. S. CIOBANU1, N. N. PUSCAS1,*

Affiliation

  1. University ''Politehnica'' of Bucharest, Physics Department, Splaiul Independentei 313, 060042, Bucharest, Romania,

Abstract

This paper presents an experimental spectroscopic study of the laser-ablation plasmas generated on different solid targets (Al, Cu and Er3+-doped Ti:LiNbO3) under room conditions. We analysed the visible spectrum in order to evaluate the peak temperature and the spatial variation of the temperature within the ablation plasma plume along the axial direction by scanning axially the plume image with a fiber tip that is coupled at a spectrometer entrance. The results indicate that the intensity of the lines increases when increasing the distance from the ablated target surface, while the plasma temperature calculated by accounting for these lines intensities is almost constant, non-dependent on the laser-irradiance and the distance from the target in the experimental conditions that we used. The laser-ablation plasmas and the generated shock waves in multi-pulse regime were further characterized by using an opto-acoustic method. Opto-acoustics allows for studying both the thermal and optical effects induced by the laser radiation, such as the changes in the dimensions of the ablated structure, ablation rate and the dynamics of the ablation products (plasma). The thermal effects such as those involved in laser ablation (e.g. melting, recrystallization) were additionally addressed by coupling time resolved reflectivity (TRR) and rapid infrared pyrometry (RIP) under atmospheric pressure hemispherical reactor. The changes of surface morphology caused by melting and recrystallization during soft or hard ablation are discussed. The dependences of the electrical conductivity on time and temperature and of the effusivity on time for Au/Ni/Bronze coating are also analysed..

Keywords

Laser plasma spectroscopy, Time resolved reflectivity, Rapid infrared pyrometry, Opto-acoustics.

Submitted at: Feb. 14, 2011
Accepted at: July 25, 2011

Citation

C. NEGUTU, M. STAFE, S. S. CIOBANU, N. N. PUSCAS, Characterization of the laser-ablation plasmas using optical spectroscopy and opto-acoustic methods, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 7, pp. 812-820 (2011)