TY  - JOUR
AU  - Polic, S.
AU  - Ristic, S.
AU  - Stašić, Jelena
AU  - Trtica, Milan
AU  - Radojkovic, B.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/287
AB  - This paper presents the results of the morphological and chemical changes on the surface of an Iranian ceramics sample irradiated by a Transversely Excited Atmospheric (TEA) CO2 and an Nd:YAG laser. The sample originates from the archeological site of Yazd (Iran) and is assumed to have been a part of an aqueduct. The effect of laser parameters (energy density (fluency), number of pulses and wavelength) on the induced changes was studied. The tests were performed in order to establish the mechanism of the interaction with the fluence above the damage threshold. This is an essential parameter in the use of lasers for cleaning as well as for eliminating surface defects such as cracks, by melting superficial layers and thus strengthening the objects in question. Another objective was to obtain as much as possible information about the material composition necessary for the conservation and restoration of this ceramics. A TEA CO2 (10.6 mu m wavelength, pulse duration 100 ns (Full Width at Half Maximum - FWHM)) laser and an Nd:YAG laser (wavelength 1064 nm and 532 nm, FWHM = 150 ps) have been used for the surface treatment. Laser fluences were in the range of 1-20 J/cm(2). The ceramics surface morphology modifications, induced by pulsed lasers, were characterized by a scanning electron microscope (SEM), while the composition was examined by energy-dispersive (EDX) and X-ray fluorescence (XRF) spectroscopy. The results show that there are significant differences depending on the laser applied and whether the surface is glazed or not. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Studies of the Iranian medieval ceramics surface modified by pulsed tea CO2 and Nd:YAG lasers
VL  - 41
IS  - 1
SP  - 85
EP  - 100
DO  - 10.1016/j.ceramint.2014.08.036
ER  - 

@article{
author = "Polic, S. and Ristic, S. and Stašić, Jelena and Trtica, Milan and Radojkovic, B.",
year = "2015",
abstract = "This paper presents the results of the morphological and chemical changes on the surface of an Iranian ceramics sample irradiated by a Transversely Excited Atmospheric (TEA) CO2 and an Nd:YAG laser. The sample originates from the archeological site of Yazd (Iran) and is assumed to have been a part of an aqueduct. The effect of laser parameters (energy density (fluency), number of pulses and wavelength) on the induced changes was studied. The tests were performed in order to establish the mechanism of the interaction with the fluence above the damage threshold. This is an essential parameter in the use of lasers for cleaning as well as for eliminating surface defects such as cracks, by melting superficial layers and thus strengthening the objects in question. Another objective was to obtain as much as possible information about the material composition necessary for the conservation and restoration of this ceramics. A TEA CO2 (10.6 mu m wavelength, pulse duration 100 ns (Full Width at Half Maximum - FWHM)) laser and an Nd:YAG laser (wavelength 1064 nm and 532 nm, FWHM = 150 ps) have been used for the surface treatment. Laser fluences were in the range of 1-20 J/cm(2). The ceramics surface morphology modifications, induced by pulsed lasers, were characterized by a scanning electron microscope (SEM), while the composition was examined by energy-dispersive (EDX) and X-ray fluorescence (XRF) spectroscopy. The results show that there are significant differences depending on the laser applied and whether the surface is glazed or not. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Studies of the Iranian medieval ceramics surface modified by pulsed tea CO2 and Nd:YAG lasers",
volume = "41",
number = "1",
pages = "85-100",
doi = "10.1016/j.ceramint.2014.08.036"
}

Polic, S., Ristic, S., Stašić, J., Trtica, M.,& Radojkovic, B.. (2015). Studies of the Iranian medieval ceramics surface modified by pulsed tea CO2 and Nd:YAG lasers. in Ceramics International, 41(1), 85-100.
https://doi.org/10.1016/j.ceramint.2014.08.036

Polic S, Ristic S, Stašić J, Trtica M, Radojkovic B. Studies of the Iranian medieval ceramics surface modified by pulsed tea CO2 and Nd:YAG lasers. in Ceramics International. 2015;41(1):85-100.
doi:10.1016/j.ceramint.2014.08.036 .

Polic, S., Ristic, S., Stašić, Jelena, Trtica, Milan, Radojkovic, B., "Studies of the Iranian medieval ceramics surface modified by pulsed tea CO2 and Nd:YAG lasers" in Ceramics International, 41, no. 1 (2015):85-100,
https://doi.org/10.1016/j.ceramint.2014.08.036 . .

TY  - JOUR
AU  - Polic-Radovanovic, S.
AU  - Ristic, S.
AU  - Stašić, Jelena
AU  - Trtica, Milan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4359
AB  - Application of non-contact and rapid laser technique, which is minimally invasive, non-contaminant and efficient method, for ancient glass investigation and cleaning is highly desirable for restoration purposes. Irradiation of Roman glass dated from 1st to 4th/5th century AD with TEA CO2 (wavelength 10.6 mu m; pulse duration t(p) = 100 ns), Nd:YAG (wavelength 1064 nm and 532 nm; t(p)= 150 ps) and ruby laser (wavelength 694 nm; t(p) = 30 ns) in air ambience was studied. For all three lasers, moderate energy densities (15-30 J/cm(2)) induced significant changes of morphology - from superficial exfoliation and occurrence of mosaic structure after few pulses to deep damages and hydrodynamic features after higher number of accumulated shots. Irradiation with moderate energy density, accompanied with plasma appearance in front of the samples, is convenient for numerous potential applications, particularly surface elemental analysis such as laser induced breakdown spectroscopy. On the other hand, lower densities are more suitable for Roman glass cleaning. Calculations of Roman glass surface temperature have shown that pulsed CO2 laser is favorable for surface cleaning and optimal fluence is similar to 2 J/cm(2). This was confirmed by additional experiments for fluences 1.5 and 3 J/cm(2). Morphological changes on the Roman glass surface induced by lasers were studied by optical microscopy (OM) and scanning electron microscopy (SEM). The composition of Roman glass was determined by energy dispersive X-ray analysis (EDX) and inductively coupled plasma (ICP) method. Chemical analysis confirmed that the investigated glass dates from the Roman period. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Journal of Non-crystalline Solids
T1  - A study of Roman glass from Mala Barutana/Belgrade Fortress irradiated with pulsed CO2, Nd:YAG and ruby laser - Comparison
VL  - 358
IS  - 22
SP  - 3048
EP  - 3056
DO  - 10.1016/j.jnoncrysol.2012.07.034
ER  - 

@article{
author = "Polic-Radovanovic, S. and Ristic, S. and Stašić, Jelena and Trtica, Milan",
year = "2012",
abstract = "Application of non-contact and rapid laser technique, which is minimally invasive, non-contaminant and efficient method, for ancient glass investigation and cleaning is highly desirable for restoration purposes. Irradiation of Roman glass dated from 1st to 4th/5th century AD with TEA CO2 (wavelength 10.6 mu m; pulse duration t(p) = 100 ns), Nd:YAG (wavelength 1064 nm and 532 nm; t(p)= 150 ps) and ruby laser (wavelength 694 nm; t(p) = 30 ns) in air ambience was studied. For all three lasers, moderate energy densities (15-30 J/cm(2)) induced significant changes of morphology - from superficial exfoliation and occurrence of mosaic structure after few pulses to deep damages and hydrodynamic features after higher number of accumulated shots. Irradiation with moderate energy density, accompanied with plasma appearance in front of the samples, is convenient for numerous potential applications, particularly surface elemental analysis such as laser induced breakdown spectroscopy. On the other hand, lower densities are more suitable for Roman glass cleaning. Calculations of Roman glass surface temperature have shown that pulsed CO2 laser is favorable for surface cleaning and optimal fluence is similar to 2 J/cm(2). This was confirmed by additional experiments for fluences 1.5 and 3 J/cm(2). Morphological changes on the Roman glass surface induced by lasers were studied by optical microscopy (OM) and scanning electron microscopy (SEM). The composition of Roman glass was determined by energy dispersive X-ray analysis (EDX) and inductively coupled plasma (ICP) method. Chemical analysis confirmed that the investigated glass dates from the Roman period. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Journal of Non-crystalline Solids",
title = "A study of Roman glass from Mala Barutana/Belgrade Fortress irradiated with pulsed CO2, Nd:YAG and ruby laser - Comparison",
volume = "358",
number = "22",
pages = "3048-3056",
doi = "10.1016/j.jnoncrysol.2012.07.034"
}

Polic-Radovanovic, S., Ristic, S., Stašić, J.,& Trtica, M.. (2012). A study of Roman glass from Mala Barutana/Belgrade Fortress irradiated with pulsed CO2, Nd:YAG and ruby laser - Comparison. in Journal of Non-crystalline Solids, 358(22), 3048-3056.
https://doi.org/10.1016/j.jnoncrysol.2012.07.034

Polic-Radovanovic S, Ristic S, Stašić J, Trtica M. A study of Roman glass from Mala Barutana/Belgrade Fortress irradiated with pulsed CO2, Nd:YAG and ruby laser - Comparison. in Journal of Non-crystalline Solids. 2012;358(22):3048-3056.
doi:10.1016/j.jnoncrysol.2012.07.034 .

Polic-Radovanovic, S., Ristic, S., Stašić, Jelena, Trtica, Milan, "A study of Roman glass from Mala Barutana/Belgrade Fortress irradiated with pulsed CO2, Nd:YAG and ruby laser - Comparison" in Journal of Non-crystalline Solids, 358, no. 22 (2012):3048-3056,
https://doi.org/10.1016/j.jnoncrysol.2012.07.034 . .