Femtosecond Laser Cleaning of Archaeological Cultural Assets

Year 2022, Volume: 17 Issue: 2, 75 - 84, 30.06.2022

Gülin Gençoğlu Korkmaz , Yasemin Gündoğdu , İlker Işık , Abuzer Kızıl , Serap Yiğit Gezgin , Hamdi Şükür Kılıç

Abstract

This study presents research on femtosecond laser ablation of corrosion crusts from ancient coin. On the surface of ancient coin sample was irradiated with 800 nm laser wavelength, 90 femtosecond laser pulses in duration, and 1 kHz repetition rate. Femtosecond laser ablation was carried out changing laser intensity using from 1.96 x1013 W/cm2 to 9.82 x 1014 W/cm2 in atmospheric conditions. Scanning electron microscope and optic microscope images were recorded and scanning electron microscope- energy dispersive X-ray spectroscopy graphs and reports were recorded. The used coin belonged to the near Roman Imperial Age where the copper-zinc alloy was used for coins. The amount of copper and zinc ratios before and after application of laser ablation procedure is reported by courtesy of scanning electron microscope-energy dispersive X-ray spectroscopy graphs and reports on surface of coin. Scanning electron microscope and light microscope images show that laser intensities above 9,82 x1014 W/cm2 perform an effective cleaning process.

Keywords

Femtosecond, Laser Cleaning, Coin, Copper, Zinc

Thanks

Authors kindly would like to thank, - Selçuk University, High Technology Research and Application Center and - University of Selçuk, SULTAN Center and Conservation and Restoration of Cultural Assets Department for supplying with infrastructure, - Republic of Turkey, Ministry of Culture to permission and to supply ancient coin. Note: The permission document to allow us to remove of corrosion layer on ancient coin samples have been got from Ministry of Culture of Republic of Turkey and they have been given back to museum after cleaning process.

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