Characterization of laser-treated paper

Applied Physics A Solids and Surfaces - Tập 79 - Trang 181-186 - 2004
P. Rudolph1, F.J. Ligterink2, J.L. Pedersoli Jr.2, M. van Bommel2, J. Bos2, H.A. Aziz3, J.B.G.A. Havermans3, H. Scholten4, D. Schipper4, W. Kautek1
1Federal Institute for Materials Research and Testing, Berlin, Germany
2Netherlands Institute for Cultural Heritage, Amsterdam, The Netherlands
3Netherlands Organization for Applied Scientific Research, Delft, The Netherlands
4Art Innovation, Hengelo, The Netherlands

Tóm tắt

Paper is one of the most important materials in cultural heritage given its extensive use as the data carrier for religious, artistic and scientific records. For both aesthetic and conservation reasons, cleaning of these materials is often needed. Current paper cleaning methods using conventional means are not always sufficient, e.g. for the local cleaning of paper in the vicinity of sensitive media. In this respect a ns-pulse laser provides a valuable tool for solving difficult cleaning problems. The influence of various laser wavelengths (355 nm, 532 nm, and 1064 nm) and the ageing status of modern paper test systems were studied. Colorimetric measurements, the determination of the average molecular mass of cellulose, and chemiluminescence analysis proved to be useful for the characterization of the laser-treated paper. Treatment with green laser light at λ=532 nm below the paper ablation threshold fluence gave the most promising results on pure papers, with no discolouration and no other visible alteration, nor detectable chemical changes.

Tài liệu tham khảo

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