Model for discoloration effect in pigments in laser cleaning of artworks by laser ablation

Boris S. Luk'yanchuk; Vassilis Zafiropulos

doi:10.1117/12.456825

25 February 2002 Model for discoloration effect in pigments in laser cleaning of artworks by laser ablation

Boris S. Luk'yanchuk, Vassilis Zafiropulos

Proceedings Volume 4426, Second International Symposium on Laser Precision Microfabrication; (2002) https://doi.org/10.1117/12.456825
Event: Second International Symposium on Laser Precision Micromachining, 2001, Singapore, Singapore

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.

Citation Download Citation

Boris S. Luk'yanchuk and Vassilis Zafiropulos "Model for discoloration effect in pigments in laser cleaning of artworks by laser ablation", Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); https://doi.org/10.1117/12.456825

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