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Proceedings Paper

Laser cleaning of graffiti on stone
Author(s): Victoria Atanassova; Ivan Kostadinov; Peter Zahariev; Margarita Grozeva; Ilko Miloushev
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Paper Abstract

In present days graffiti is a common problem that many restorers have to deal with due to both its unaesthetic appearance and damaging nature for the surface beneath. We report laser cleaning of graffiti paints (black, white, blue, green and red) on limestone and granite. The efficiency of two laser systems is compared: high repetition rate (20 kHz) Copper Bromide Vapor Laser (CuBrVL) generating wavelength 510.6 nm and low repetition rate (up to 10 Hz) Q-switched Nd:YAG laser generating fundamental wavelength 1064 nm and its second harmonic 532 nm. The surface condition of the stone samples before and after cleaning is evaluated by means of optical microscopy. On that base, suitable working parameters are chosen in order to avoid under- or over-cleaning.

Paper Details

Date Published: 5 January 2017
PDF: 9 pages
Proc. SPIE 10226, 19th International Conference and School on Quantum Electronics: Laser Physics and Applications, 102260A (5 January 2017); doi: 10.1117/12.2262668
Show Author Affiliations
Victoria Atanassova, Institute of Solid State Physics (Bulgaria)
Ivan Kostadinov, Institute of Solid State Physics (Bulgaria)
Peter Zahariev, Institute of Solid State Physics (Bulgaria)
Margarita Grozeva, Institute of Solid State Physics (Bulgaria)
Ilko Miloushev, Institute of Solid State Physics (Bulgaria)


Published in SPIE Proceedings Vol. 10226:
19th International Conference and School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Sanka Gateva; Albena Daskalova; Alexandros Serafetinides, Editor(s)

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