The effect of ultrafast lasers on laser cleaning

Watkins, Ken; Fitzsimons, Paul; Sokhan, M.; McPhail, Donald R.

doi:10.1201/b10567-3

Cited by 3 publications

(2 citation statements)

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“…The laser beam output was fixed above a sample mounted on an A3-axis motion-control system (Aerotech, Ramsdell) in conjunction with NView MMI software to manipulate samples and select the size of the scanning area with an automatic distance detection and adjustment of the laser beam focus. The experimental set-up of the laser systems has been reported for conservation purposes previously (Pouli et al, 2005;Watkins et al, 2009;Kono et al, 2013).…”

Section: Laser Cleaningmentioning

confidence: 99%

Viability of laser cleaning of papyrus: Conservation and scientific assessment

Elnaggar

Fitzsimons

Nevin

et al. 2015

Studies in Conservation

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There has been a growing interest in laser cleaning applications for a variety of organic materials such as paper, parchment, textiles, and leather during the last decade. However, archaeological organic materials, notably papyrus, have rarely been investigated. This contribution examines whether removal of burial encrustation can be justified in view of its short-term and long-term effects on the substrate. To examine this, tests using mock objects have been performed. Using artificially soiled and archaeological papyrus samples, optimization of laser cleaning parameters using a picosecond laser (1064 nm, various operating conditions) was attempted. Optimization was based on colorimetry, optical microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and cellulose degree of polymerization data, both before and after accelerated degradation. In papyrus, there is no clear damage threshold, and substrate degradation can always be observed and is comparable in treated (cleaned) and untreated (soiled) objects. Therefore, the decision on whether to clean papyrus using lasers is predominantly based on aesthetic and treatability (e.g. need for consolidation) criteria.

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Section: Laser Cleaningmentioning

confidence: 99%

Viability of laser cleaning of papyrus: Conservation and scientific assessment

Elnaggar

Fitzsimons

Nevin

et al. 2015

Studies in Conservation

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“…The lasers were clamped at a fixed position above the sample, which was mounted on motorized A3-axis motion control system (Aerotech) in conjunction with NView MMI software to manipulate samples, calculate laser parameters and select the size of scanning area with automatic distance detection and adjustment of the laser focus for uniform cleaning. The experimental set up of the ultrafast laser systems employed here has been reported for conservation purposes elsewhere [25] where femtosconed and picosconed lasers were employed successfully to clean painted objects and ancient papyrus [26,27].…”

Section: Laser Testsmentioning

confidence: 99%

Feasibility of ultrafast picosecond laser cleaning of soiling on historical leather buckles

et al. 2016

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The aim of the research is to present a system recently developed and used for automated cleaning of artworks and to examine the suitability of using this ultrafast and precise computed-scanning picosecond laser (1064 nm) with a repetition rate of 10 kHz and a temporal pulse length of 10 ps for the removal of soiling from leather buckles without damaging the leather substrate. Preliminary tests will be performed with the model artificially aged vegetable tanned samples to determine the leather damage threshold fluence and the soiling ablation threshold fluence before using a laser for the removal of the soiling from a historical leather buckle. As laser cleaning requires a physical parameterization for optimization of cleaning accompanied with an assessment of the morphological and chemical changes of leather, an investigations were performed to determine the leather damage and ablation threshold fluences of artificially aged and historical vegetable tanned leather using a number of analytical techniques including differential scanning calorimetry, optical microscopy, scanning electronic microscope with energy dispersive X-ray analysis, colorimetry and Fourier transform infrared spectroscopy have been used. Following optimization trials of the picosecond laser cleaning parameters on model leather samples, satisfactory removal of the soiling over the historical leather surface is achieved.

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Lasers in the Conservation of Artworks VIII

Nevin¹

2010

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The effect of ultrafast lasers on laser cleaning

Cited by 3 publications

References 0 publications

Viability of laser cleaning of papyrus: Conservation and scientific assessment

Viability of laser cleaning of papyrus: Conservation and scientific assessment

Feasibility of ultrafast picosecond laser cleaning of soiling on historical leather buckles

Lasers in the Conservation of Artworks VIII

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