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Proceedings Paper

Laser techniques for cultural heritage research case studies
Author(s): G. Sliwiński; M. Jasińska; J. Bredal-Jørgensen; A. Kamińska; K. Komar; M. Sawczak
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Paper Abstract

Results of the recent application studies of laser-based techniques for conservation practice, carried out in the frames of research and conservation projects are presented and discussed. The Gotland Sandstone Project covers laser cleaning, spectroscopic techniques of the process monitoring and materials analysis. The post-processing effect is investigated by means of LIBS, colorimetry, SEM and XEDS in order to answer questions regarding encrustation removal, discoloration and alteration due to environmental pollution and laser interaction, respectively. The cleaning is monitored acoustically. Slight differences in stone yellowing are revealed when applying laser in air or pure N2 environment which is ascribed to material oxidation and partial combustion of surface remnants due to presence of O2 contributing to the final effect of laser cleaning. Results of microscopic observation are supported by the presence of elements S, Al, Ca, and C which prevail in crust. In case of restoration of the historical documents on paper the ablative cleaning and the nearly nondestructive identification and composition analysis of surface layers such as contaminants, substrate and pigments are performed. Spectra obtained by means of the LIPS technique for historical, originally contaminated and also artificially soiled model samples reveal reach structures. The emission lines of Ca, Na, K, Al and Fe are ascribed to contaminants because of intensities decreasing with prolonged surface irradiation during laser cleaning. Bands of Ti and Ba correspond to white pigments (TiO2 and BaSO4) in the paper and are confirmed by the Raman spectra as well. For identification of historical pigments the reference measurements on model substrates are performed, too.

Paper Details

Date Published: 13 March 2007
PDF: 11 pages
Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66040T (13 March 2007); doi: 10.1117/12.726906
Show Author Affiliations
G. Sliwiński, Polish Academy of Science (Poland)
M. Jasińska, Polish Academy of Science (Poland)
J. Bredal-Jørgensen, Konservatorskolen (Denmark)
A. Kamińska, Agency for Integration of Conservation Activities (Poland)
K. Komar, Polish Academy of Science (Poland)
M. Sawczak, Polish Academy of Science (Poland)

Published in SPIE Proceedings Vol. 6604:
14th International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Tanja N. Dreischuh; Sanka V. Gateva; Lubomir M. Kovachev, Editor(s)

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