Femtosecond Laser Cleaning of Metallic Cultural Heritage and Antique Artworks

Burmester, T.; Meier, Michael; Haferkamp, H.; Barcikowski, Stephan; Bunte, J.; Ostendorf, Andreas

doi:10.1007/3-540-27176-7_8

Cited by 21 publications

(9 citation statements)

References 5 publications

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“…The advance in ultrashort laser cleaning presented in this study is the demonstration of successful treatment of complex and fragile heritage objects in a safe and controllable way which, in contrast to previous fs studies ,− is achieved via in situ monitoring of the ablated plume to provide immediate feedback on the species removed from the surface by each laser pulse.…”

Section: Discussionmentioning

confidence: 99%

“…The cold atoms are then swiftly displaced from their positions in the lattice by the electrostatic field imposed by the gradient of electronic temperature across the skin layer. − This causes the thin surface layer to be ablated faster than the time required for energy dissipation from the surface into the bulk; consequently it is termed “cold” ablation. Due to the absence of significant heat- or shock-wave generation, the laser-affected region near the surface is only a few hundred atomic layers thick, resulting in etch depths as low as 20 nm per pulse which significantly improves the ablation precision. ,, The advantages of precise removal of surface layers by ultrafast pulses have already been proven in applications that are sensitive to collateral damage, such as dentistry, eye surgery, and precise micromachining, ,− and lately in the cleaning of painted works of art and discoloration of dyes. ,− …”

Section: Introductionmentioning

confidence: 99%

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Treating the Untreatable in Art and Heritage Materials: Ultrafast Laser Cleaning of “Cloth-of-Gold”

Kono¹,

Baldwin

Wain

et al. 2015

Langmuir

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Treating the Untreatable in Art and Heritage Materials: Ultrafast Laser Cleaning of “Cloth-of-Gold”

Kono¹,

Baldwin

Wain

et al. 2015

Langmuir

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“…It is generally agreed that a shorter pulse duration reduces thermal effects and lessens the risk of micromelting [1,24,33]. Hypotheses toward laser parameter optimization posit the critical roles of laser fluence [3,21,27,28], materials absorptivity [1,3,23,24,27], and thermal conductivity [1,34] in the safe and effective removal of corrosion layers.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-dependent absorption and scattering effects on laser cleaning of a corroded iron alloy European scale armor

Yandrisevits¹,

Londero²,

Carò³

et al. 2017

Proceedings of the International Conference LACONA XI

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This research seeks to optimize Nd:YAG laser cleaning parameters for the removal of corrosion products on historic iron alloy surfaces. This article presents the treatment of a 19th-century, European scale armor jazeran in the collection of the Arms and Armor Department at The Metropolitan Museum of Art. Laser cleaning was coupled with traditional mechanical cleaning techniques to increase the time efficiency of treatment while best preserving the composite material construction of the artifact and the aesthetic expectations of treatment. Laser cleaning using an 8 ns, Q-switched, Nd:YAG laser at 532 nm was found more effective at corrosion removal and less damaging to the underlying metal surface than laser cleaning at 1064 nm. Wavelength-dependent absorption and scattering effects on the laser cleaning of the corroded iron alloy surfaces were investigated. The composition, morphology, and stratigraphy of the corrosion layers were characterized and the effects of laser cleaning of these corrosion layers at 1064 nm and 532 nm were examined using stereomicroscopy, scanning electron microscopy -energy dispersive spectroscopy and back-scattered and secondary electron imaging, Raman spectroscopy, Fourier transform -infrared spectroscopy, and thermally assisted hydrolysis and methylation -gas chromatography -mass spectrometry. It was found that the success of the 532 nm laser cleaning is consistent with the green laser's more resonant energy absorption and decreased scattering length as compared to 1064 nm. These data were used to optimize the optical parameters of the laser energy interaction with the corrosion products to develop more effective and safer laser cleaning profiles for the removal of ferrous corrosion layers on the historic iron alloy surface.

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“…The above studies have been mainly investigating the effects that the radiation of various laser systems at different wavelengths with nanosecond (ns) pulse duration may cause. Recently, the use of ultrashort laser pulses to clean metal surfaces was reported with very interesting results [9]. Such lasers may be a viable solution to many of the above mentioned unclear issues in metal conservation as they offer unique advantages in comparison to the ns laser systems; such as minimal thermally and chemically induced alterations, higher spatial confinement, control, and so forth [10].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study for the Laser Cleaning of Corrosion Layers due to Environmental Pollution for Metal Objects of Cultural Value: Preliminary Studies on Artificially Corroded Coupons

et al. 2006

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This paper is focused on the systematic investigation of the layer-by-layer removal of corrosion products on artificially corroded metal coupons aiming to introduce a methodology for the optimum laser cleaning approach of historical metal objects. Thus, it is very important to determine the chemical composition of the studied surfaces before and after irradiation. A series of laser cleaning studies has been performed on test coupons (reference and artificially corroded). Wavelength and pulse duration effects are investigated. Initial studies were focused on the use of infrared (1064 nm) and ultraviolet (355 nm and 248 nm) radiations of nanosecond (ns) pulse duration. Damage and removal threshold values were determined for the substrates and the corrosion layers, respectively. The irradiated surfaces are evaluated microscopically under the optical and the scanning electron microscope, while the mineralogical and chemical composition of the various layers is determined with X-ray diffraction and SEM-EDAX analyses, respectively. The results obtained are providing a comprehensive approach for understanding the main mechanisms that are significant in the different laser cleaning regimes, while the optimum cleaning methodologies for the studied materials are being established.

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Femtosecond Laser Cleaning of Metallic Cultural Heritage and Antique Artworks

Cited by 21 publications

References 5 publications

Treating the Untreatable in Art and Heritage Materials: Ultrafast Laser Cleaning of “Cloth-of-Gold”

Treating the Untreatable in Art and Heritage Materials: Ultrafast Laser Cleaning of “Cloth-of-Gold”

Wavelength-dependent absorption and scattering effects on laser cleaning of a corroded iron alloy European scale armor

A Comprehensive Study for the Laser Cleaning of Corrosion Layers due to Environmental Pollution for Metal Objects of Cultural Value: Preliminary Studies on Artificially Corroded Coupons

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