Picosecond laser ablation system with process control by optical coherence tomography

Targowski, Piotr; Ostrowski, Roman; Marczak, J.; Sylwestrzak, Marcin; E, Kwiatkowska

doi:10.1117/12.827286

Cited by 12 publications

(13 citation statements)

References 14 publications

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“…It has been used to examine the stratigraphy of paint and varnish layers of historical paintings and shown to be the most sensitive technique for revealing preparatory drawings beneath paint layers owing to its high dynamic range and depth selection capabilities [6]. It has also been used for dynamic monitoring of the wetting and drying of different varnishes [7], varnish removal using solvents [5], real time laser ablation of varnish layers [8] and tracking of canvas deformation due to environmental changes [9]. While OCT has been successfully applied to the examination of the stratigraphy of paintings, the depth resolution of OCTs used in these applications still cannot match the micro-destructive method of optical microscopic examination of paint samples prepared as cross-sections (typical resolution ~1 µm).…”

Section: Introductionmentioning

confidence: 99%

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Cheung¹,

Spring²,

Liang³

2015

Opt. Express

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Abstract:In the last 10 years, Optical Coherence Tomography (OCT) has been successfully applied to art conservation, history and archaeology. OCT has the potential to become a routine non-invasive tool in museums allowing cross-section imaging anywhere on an intact object where there are no other methods of obtaining subsurface information. While current commercial OCTs have shown potential in this field, they are still limited in depth resolution (> 4 μm in paint and varnish) compared to conventional microscopic examination of sampled paint cross-sections (~1 μm). An ultrahigh resolution fiber-based Fourier domain optical coherence tomography system with a constant axial resolution of 1.2 μm in varnish or paint throughout a depth range of 1.5 mm has been developed. While Fourier domain OCT of similar resolution has been demonstrated recently, the sensitivity roll-off of some of these systems are still significant. In contrast, this current system achieved a sensitivity roll-off that is less than 2 dB over a 1.2 mm depth range with an incident power of ~1 mW on the sample. The high resolution and sensitivity of the system makes it convenient to image thin varnish and glaze layers with unprecedented contrast. The non-invasive 'virtual' cross-section images obtained with the system show the thin varnish layers with similar resolution in the depth direction but superior clarity in the layer interfaces when compared with conventional optical microscope images of actual paint sample cross-sections obtained microdestructively.

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Section: Introductionmentioning

confidence: 99%

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Cheung¹,

Spring²,

Liang³

2015

Opt. Express

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“…OCT has already been implemented in the infrared range and in the Fourier domain for studying topography of works of art [4,7]. A full-field OCT in the time domain has been recently developed at INSP, working in the visible range [12,13] [ Fig.…”

Section: B Optical Coherence Tomographymentioning

confidence: 99%

“…It can also be a tool for drawing up a status report before and after an exhibition or a loan and for the fight against forgery [3]. The modification of the surface state can be due to a restoration or to specific conditions of conservation or exhibitions and must be checked during the follow-up and the monitoring of conservation or restoration treatments [4][5][6][7]. Finally, surface metrology is also a method able to identify some artistic techniques that stand out by their roughness [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Optics in the visible range is then a prioritized field and allows establishing the link between gloss and surface topography. Previous studies have already been published, each focusing on a particular artistic case and using a given optical instrument [2][3][4][5][6][7][8]. Imaging is prioritized in these studies and quantitative surface characteristics are rarely provided.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of surface state characterization to studies of works of art

2010

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This paper has two purposes. The first one underlines that qualitative and quantitative studies of surface states lead to relevant information for analyzing works of art, with lots of potential for art history, restorers, and curators. The discrimination between different artistic techniques and the influence of a varnish on the leveling of paint surfaces are presented. The second purpose is the comparison between different nondestructive optical topographic methods, i.e., goniophotometry, optical coherence topography, and confocal microscopy, according to their accuracy, their discriminatory ability, their practicability inside a museum, and the size limits of the studied objects.

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“…Up to now, experiments have been conducted with three groups of varnishes (dammar, ketone, and acrylic), employing different lasers operating both in the far infrared (λ = 2.936 µm) [42,52] and in the UV (λ = 0.266 µm) [53,54]. Depending on the laser/varnish combination, OCT enabled the distinction of three processes caused by laser radiation: true ablation of the varnish layer, its exfoliation, and its melting.…”

Section: Prospective Application Of Oct As a Supporting Tool For Lasementioning

confidence: 99%

Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review

2011

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A brief introduction to Optical Coherence Tomography (OCT) is presented, stressing the origin of the tomographic signal and the detection methods defining various modalities of the technique. The parameters of the tomographs, such as axial and lateral resolution, wavelength and intensity of the probing light, imaging range, time of examination, and sensitivity are then defined, and a paradigm for interpreting the OCT tomograms provided. The second part of the article comprises a review of the utilisation of OCT for structural examination of artworks, illustrated with some representative results. Applications to the structural imaging of semi-transparent subsurface layers such as varnishes and glazes, of underdrawings and of reverse painting on glass, are described first, and then applications in the examination of the structure and state of preservation of historic glass, jade, glazed porcelain and faience are discussed. Finally, the use of OCT combined with LIBS analysis and laser ablation of surface layers is presented.

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Picosecond laser ablation system with process control by optical coherence tomography

Cited by 12 publications

References 14 publications

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Contribution of surface state characterization to studies of works of art

Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review

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