Sulphur selective ablation by UV laser

Antonella Lorusso; Vincenzo Nassisi; Fabio Belloni; Giovanni Buccolieri; Giuseppe Caretto; Alfredo Castellano

doi:10.1117/12.612282

12 August 2005 Sulphur selective ablation by UV laser

Antonella Lorusso, Vincenzo Nassisi, Fabio Belloni, Giovanni Buccolieri, Giuseppe Caretto, Alfredo Castellano

Proceedings Volume 5857, Optical Methods for Arts and Archaeology; 585707 (2005) https://doi.org/10.1117/12.612282
Event: Optical Metrology, 2005, Munich, Germany

Abstract

In this work we report the preliminary experimental results on the selective ablation of sulphur in ancient stones. The sulphur concentration was reduced after laser action. For this goal an excimer laser operating at 308 nm wavelength and time duration of 20 ns was used. In order to estimate the sulphur concentration before and after laser cleaning, a portable apparatus for energy-dispersive X-ray fluorescence (EDXRF) was utilised. The processed sample were characterized by an initial sulphur concentration of 2.8% w/w. After the laser treatment, sulphur concentration decreased after a total deposited energy of about 30 J/cm² up to 1.2% w/w value. Due to the porosity of the stone, in fact, it is difficult to eliminate completely the S presence in the composition of the stones. It was also observed that after a few laser shots the initial black area of the stone became white showing in this way the great potential of the laser action on the cleaning process of the pietra leccese.

Citation Download Citation

Antonella Lorusso, Vincenzo Nassisi, Fabio Belloni, Giovanni Buccolieri, Giuseppe Caretto, and Alfredo Castellano "Sulphur selective ablation by UV laser", Proc. SPIE 5857, Optical Methods for Arts and Archaeology, 585707 (12 August 2005); https://doi.org/10.1117/12.612282

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