Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces
In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Ciofini, Daniele [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016transfer abstract |
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| Umfang: |
12 |
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| Übergeordnetes Werk: |
Enthalten in: A Patient With Dyspnea and Right Leg Heaviness - Yano, Haruka ELSEVIER, 2022, Orlando, Fla |
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| Übergeordnetes Werk: |
volume:124 ; year:2016 ; pages:792-803 ; extent:12 |
| Links: |
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| DOI / URN: |
10.1016/j.microc.2015.10.031 |
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| 520 | |a In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. | ||
| 520 | |a In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. | ||
| 700 | 1 | |a Oujja, Mohamed |4 oth | |
| 700 | 1 | |a Cañamares, Maria Vega |4 oth | |
| 700 | 1 | |a Siano, Salvatore |4 oth | |
| 700 | 1 | |a Castillejo, Marta |4 oth | |
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10.1016/j.microc.2015.10.031 doi GBVA2016023000018.pica (DE-627)ELV019910088 (ELSEVIER)S0026-265X(15)00261-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 44.80 bkl Ciofini, Daniele verfasserin aut Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces 2016transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. Oujja, Mohamed oth Cañamares, Maria Vega oth Siano, Salvatore oth Castillejo, Marta oth Enthalten in Academic Press Yano, Haruka ELSEVIER A Patient With Dyspnea and Right Leg Heaviness 2022 Orlando, Fla (DE-627)ELV009437061 volume:124 year:2016 pages:792-803 extent:12 https://doi.org/10.1016/j.microc.2015.10.031 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.80 Unfallmedizin Notfallmedizin VZ AR 124 2016 792-803 12 045F 540 |
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10.1016/j.microc.2015.10.031 doi GBVA2016023000018.pica (DE-627)ELV019910088 (ELSEVIER)S0026-265X(15)00261-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 44.80 bkl Ciofini, Daniele verfasserin aut Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces 2016transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. Oujja, Mohamed oth Cañamares, Maria Vega oth Siano, Salvatore oth Castillejo, Marta oth Enthalten in Academic Press Yano, Haruka ELSEVIER A Patient With Dyspnea and Right Leg Heaviness 2022 Orlando, Fla (DE-627)ELV009437061 volume:124 year:2016 pages:792-803 extent:12 https://doi.org/10.1016/j.microc.2015.10.031 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.80 Unfallmedizin Notfallmedizin VZ AR 124 2016 792-803 12 045F 540 |
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10.1016/j.microc.2015.10.031 doi GBVA2016023000018.pica (DE-627)ELV019910088 (ELSEVIER)S0026-265X(15)00261-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 44.80 bkl Ciofini, Daniele verfasserin aut Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces 2016transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. Oujja, Mohamed oth Cañamares, Maria Vega oth Siano, Salvatore oth Castillejo, Marta oth Enthalten in Academic Press Yano, Haruka ELSEVIER A Patient With Dyspnea and Right Leg Heaviness 2022 Orlando, Fla (DE-627)ELV009437061 volume:124 year:2016 pages:792-803 extent:12 https://doi.org/10.1016/j.microc.2015.10.031 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.80 Unfallmedizin Notfallmedizin VZ AR 124 2016 792-803 12 045F 540 |
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10.1016/j.microc.2015.10.031 doi GBVA2016023000018.pica (DE-627)ELV019910088 (ELSEVIER)S0026-265X(15)00261-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 44.80 bkl Ciofini, Daniele verfasserin aut Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces 2016transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. Oujja, Mohamed oth Cañamares, Maria Vega oth Siano, Salvatore oth Castillejo, Marta oth Enthalten in Academic Press Yano, Haruka ELSEVIER A Patient With Dyspnea and Right Leg Heaviness 2022 Orlando, Fla (DE-627)ELV009437061 volume:124 year:2016 pages:792-803 extent:12 https://doi.org/10.1016/j.microc.2015.10.031 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.80 Unfallmedizin Notfallmedizin VZ AR 124 2016 792-803 12 045F 540 |
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10.1016/j.microc.2015.10.031 doi GBVA2016023000018.pica (DE-627)ELV019910088 (ELSEVIER)S0026-265X(15)00261-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 44.80 bkl Ciofini, Daniele verfasserin aut Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces 2016transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. Oujja, Mohamed oth Cañamares, Maria Vega oth Siano, Salvatore oth Castillejo, Marta oth Enthalten in Academic Press Yano, Haruka ELSEVIER A Patient With Dyspnea and Right Leg Heaviness 2022 Orlando, Fla (DE-627)ELV009437061 volume:124 year:2016 pages:792-803 extent:12 https://doi.org/10.1016/j.microc.2015.10.031 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.80 Unfallmedizin Notfallmedizin VZ AR 124 2016 792-803 12 045F 540 |
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spectroscopic assessment of the uv laser removal of varnishes from painted surfaces |
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Spectroscopic assessment of the UV laser removal of varnishes from painted surfaces |
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In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. |
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In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. |
| abstract_unstemmed |
In the present work, we focus on the assessment of the chemical and physical side effects induced by UV laser ablation of varnish samples (i.e. mastic, oil-mastic, dammar, and bleached shellac) after natural curing and artificial ageing using micro-Raman spectroscopy, laser-induced fluorescence and environmental scanning electron microscopy. The varnish films were irradiated with the fifth (213nm) and fourth (266nm) harmonics of a Q-switched Nd: YAG laser. Besides the systematic microscopy inspection of the irradiated areas, a significant effort was devoted to the study of the optical properties of the varnish films by means of UV-Vis absorption spectroscopy, which allowed the determination of linear absorption coefficients at the present laser irradiation wavelengths. Single-pulse laser ablation thresholds were measured by applying the spot regression method, and processing of the films was carried out using three different scanning speeds that resulted in 1, 5, and 10 laser pulses on each irradiated area. The results achieved using laser fluences well above the single-pulse ablation threshold of the treated varnishes, indicated that the quality of the material removal process crucially depends on the irradiation wavelength, type of varnish, and on its degree of polymerization. In contrast with the undesired modifications observed at 266nm, that led to the formation of microbubbles, which produced a whitish appearance of the irradiated area, the absence of relevant side effect at 213nm emphasizes the importance of using a highly absorbed wavelength to finely remove the altered uppermost layer of different types of aged varnishes. |
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