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Proceedings Paper

Model for discoloration effect in pigments in laser cleaning of artworks by laser ablation
Author(s): Boris S. Luk'yanchuk; Vassilis Zafiropulos
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Paper Abstract

The physical mechanism and the theoretical model for pigment discoloration at laser ablation are discussed. The model includes two subsequent steps: 1) examination of ablation in subthreshold (Arrhenius tail) region and 2) examination of the nucleation process and structural modification within the volume of material close to ablation front. The results of calculations show that in the wide range of parameters exists the strong sharpening effect, when the thickness of modified layer (a few nanometers) is significantly smaller than the heat penetration depth or depth of optical absorption. These results are in good agreement with experimental data on discoloration effect.

Paper Details

Date Published: 25 February 2002
PDF: 8 pages
Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); doi: 10.1117/12.456825
Show Author Affiliations
Boris S. Luk'yanchuk, Data Storage Institute (Singapore)
Vassilis Zafiropulos, Foundation for Research and Technology-Hellas (Greece)


Published in SPIE Proceedings Vol. 4426:
Second International Symposium on Laser Precision Microfabrication

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