TY - CONF A1 - Pentzien, Simone A1 - Conradi, Andrea A1 - Koter, Robert A1 - Krüger, Jörg A2 - Engel, P. A2 - Schirò, J. A2 - Larsen, R. A2 - Moussakova, E. A2 - Kecskeméti, I. T1 - Cleaning of soiled paper model samples using short and ultrashort laser pulses T2 - Conference 'New Approaches to Book and Paper Conservation - Restoration' (Proceedings) N2 - Paper is one of the most important materials representing and witnessing human culture particularly as a carrier medium for text and image. As soiling hampers the reception of information, paper cleaning techniques are needed. Traditional mechanical and chemical cleaning methods are used by conservator-restorers. In some cases, a classical cleaning procedure of paper objects yields unsatisfactory results or a conventional treatment is even impossible. Especially, fragile paper objects cause problems due to mechanical instabilities. Laser cleaning as a non-contact method might be a way to overcome some of the limitations of classical cleaning techniques. Laser parameters have to be chosen to achieve removal of the soiling without influencing the artwork. Any immediate as well as long-term effects causing an irreversible change of the artwork have to be avoided. At present, most laser applications are found in stone and metal conservation, while laser treatment of complex organic materials like paper is still not fully developed for application in conservators' workshops. This contribution describes recent work of pulsed laser cleaning of soiled model samples. Pure cellulose, rag paper and wood-pulp paper were mechanically soiled with pulverized charcoal in a standardized procedure to make model samples representing essential characteristics of contaminated real-world artworks. Afterwards, model samples were cleaned using short and ultrashort laser pulses in the nanosecond and femtosecond time domain, respectively. An extensive analysis of the model samples after laser treatment using an optical microscope and a multi-spectral imaging system allows a comparison of the cleaning results obtained with both laser sources. PB - Verlag Berger, Horn CY - Vienna, Austria T2 - Conference 'New Approaches to Book and Paper Conservation - Restoration' CY - Horn, Austria DA - 09.05.2011 KW - Laser cleaning KW - Ablation KW - Laser impact on surfaces KW - Paper KW - Femtosecond laser KW - Nanosecond laser PY - 2011 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/23705 AN - OPUS4-23705 SN - 978-3-85028-518-6 SP - 519 EP - 532 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany