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Proceedings Paper

Laser damage thresholds of bone objects
Author(s): Roman Ostrowski; Jan Marczak; Marek Strzelec; Andrzej Koss
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Paper Abstract

The main aim of laser cleaning is removal of encrustation without damage of original artwork substrate material. Art object are often made of fragile and breakage vulnerable materials, for which laser cleaning is an irreplaceable technique. The same applies to figures and sculptures made of different kinds of bones, so it is needed to determine damage threshold values of laser fluency. The paper, therefore, presents the results of investigations of pulse laser radiation interaction with bovine bones, ivory and bear tusk, utilizing different harmonic wavelengths of Nd:YAG laser in a wide range of fluences. It includes fundamental wavelength of 1064 nm with maximum energy of 500 mJ and harmonics: 532 nm (250 mJ) and 355 nm (90 mJ), generated by ReNOVALaser 5 system. Laser fluency has been controlled by means of direct energy variations or by radiation focusing at the object (from 8 mm to 300 &mgr;m), using constant pulse duration of 15 ns. Exact determination of bones threshold damage was based on microscopic investigation of the results of laser pulse irradiation.

Paper Details

Date Published: 16 July 2007
PDF: 11 pages
Proc. SPIE 6618, O3A: Optics for Arts, Architecture, and Archaeology, 66181D (16 July 2007); doi: 10.1117/12.726117
Show Author Affiliations
Roman Ostrowski, Military Univ. of Technology (Poland)
Jan Marczak, Military Univ. of Technology (Poland)
Marek Strzelec, Military Univ. of Technology (Poland)
Andrzej Koss, Academy of Fine Arts (Poland)

Published in SPIE Proceedings Vol. 6618:
O3A: Optics for Arts, Architecture, and Archaeology
Costas Fotakis; Luca Pezzati; Renzo Salimbeni, Editor(s)

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