16 July 2007 Laser damage thresholds of bone objects
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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.
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Roman Ostrowski, Jan Marczak, Marek Strzelec, Andrzej Koss, "Laser damage thresholds of bone objects", Proc. SPIE 6618, O3A: Optics for Arts, Architecture, and Archaeology, 66181D (16 July 2007); doi: 10.1117/12.726117; https://doi.org/10.1117/12.726117
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