The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
M T Floresarias - One of the best experts on this subject based on the ideXlab platform.
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single pulse laser ablation threshold of borosilicate fused silica sapphire and soda Lime Glass for pulse widths of 500 fs 10 ps 20 ns
Applied Optics, 2015Co-Authors: Daniel Nieto, Gerard M Oconnor, Justo Arines, M T FloresariasAbstract:In this work, we report a comparative study of the laser ablation threshold of borosilicate, fused silica, sapphire, and soda-Lime Glass as a function of the pulse width and for IR laser wavelengths. We determine the ablation threshold for three different pulse durations: τ=500 fs, 10 ps, and 20 ns. Experiments have been performed using a single laser pulse per shot in an ambient (air) environment. The results show a significant difference, of two orders of magnitude, between the group of ablation thresholds obtained for femtosecond, picosecond, and nanosecond pulses. This difference is reduced to 1 order of magnitude in the soda-Lime substrate with tin impurities, pointing out the importance of the incubation effect. The morphology of the marks generated over the different Glass materials by one single pulse of different pulse durations has been analyzed using a scanning electron microscope (FESEM ULTRA Plus). Our results are important for practical purposes, providing the ablation threshold data of four commonly used substrates at three different pulse durations in the infrared regime (1030–1064 nm) and complete data for increasing the understanding of the differences in the mechanism’s leading ablation in the nanosecond, picosecond, and femtosecond regimes.
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fabrication of microlens arrays on soda Lime Glass using a laser direct write technique and a thermal treatment assisted by a co2 laser
Optics and Lasers in Engineering, 2015Co-Authors: Tamara Delgado, Daniel Nieto, M T FloresariasAbstract:Abstract A low-cost method for fabricating microlens arrays on commercial soda-Lime Glass is presented. The hybrid technique is composed by a laser direct writing technique and a laser assisted post-thermal treatment. In particular we use a nanosecond Q-Switch Nd:YVO 4 laser for fabricating the initial structure of microposts on soda-Lime Glass substrates and a CO 2 laser combined with a furnace for reshaping and improving its morphological and optical qualities. This new fabrication approach lets us obtain a high quality microlenses array with a diameter of 50 μm, sag 1.5 μm, focal length 1 mm and a spot size of 7.8 μm. Furthermore, the proposed technique preserves the advantages of the laser direct-write technique in terms of design flexibility, simplicity, fast prototyping, low cost and so on; while the alternative laser assisted thermal treatment lets us overcome the bounding problems presented in other conventional thermal treatments.
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fabrication of microchannels on soda Lime Glass substrates with a nd yvo4 laser
Optics and Lasers in Engineering, 2014Co-Authors: Daniel Nieto, Tamara Delgado, M T FloresariasAbstract:Abstract A new method for fabricating microchannels for microfluidic applications on soda-Lime Glass has been developed. It consists of a combination of a laser direct write technique for fabricating the microchannels and a thermal treatment for reshaping and/or improving the morphological qualities of the generated microchannels. The proposed technique allows us to obtain microchannels with a minimum diameter of 8 µm and 1.5 µm of depth. A decrease of two orders of magnitude of the average roughness generated after the laser ablation, reaching values of the order of the unprocessed Glass, has been obtained thanks to the thermal treatment. The use of pulsed nanosecond lasers for the laser direct write presents the benefits of using lasers commonly implemented in the industry for laser processing of materials. This fact makes the technique presented highly competitive compared with others used for Glass microstructuring.
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fluence ablation threshold dependence on tin impurities in commercial soda Lime Glass
Applied Optics, 2014Co-Authors: Daniel Nieto, Justo Arines, M T FloresariasAbstract:In this paper, we study the reduction in the fluence ablation threshold induced by tin impurities incorporated in float soda-Lime Glass during the fabrication process. The laser system used in the experiments was a Nd:YVO4 laser operating at 1064 nm with a pulse duration of 20 ns. The fluence ablation thresholds found were 112 J/cm2 for the tin side and 920 J/cm2 for the tin-free side, which means a reduction of nearly 1 order of magnitude. The fluence ablation threshold reduction permits the manufacturing of narrower grooves with small level of roughness, obtaining quality elements in low-cost soda-Lime substrates.
Adélio Mendes - One of the best experts on this subject based on the ideXlab platform.
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low temperature hermetic laser assisted Glass frit encapsulation of soda Lime Glass substrates
Optics and Lasers in Engineering, 2017Co-Authors: Seyedali Emami, Joaquim Mendes, Luisa Andrade, Jorge Martins, Adélio MendesAbstract:Abstract Room temperature and low temperature (120 °C) laser-assisted Glass frit bonding of soda-Lime Glass substrates are accomplished in this work. The locally laser melted bonding showed hermeticity with helium leak rate of −8 atm cm 3 s −1 , maintaining its leak rate even after standard climatic cycle tests. Small size devices were bonded at room temperature while larger areas were sealed at the process temperature of 120 °C. The sealing parameters were optimized through response surface methodology that makes the process capable for further development regardless of device size.
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Low temperature hermetic laser-assisted Glass frit encapsulation of soda-Lime Glass substrates
'Elsevier BV', 2017Co-Authors: Seyedali Emami, Joaquim Mendes, Luisa Andrade, Jorge Martins, Adélio MendesAbstract:Room temperature and low temperature (120 degrees C) laser-assisted Glass frit bonding of soda-Lime Glass substrates are accomplished in this work. The locally laser melted bonding showed hermeticity with helium leak rate of < 5 x 10(-8) atm cm(3) s(-1), maintaining its leak rate even after standard climatic cycle tests. Small size devices were bonded at room temperature while larger areas were sealed at the process temperature of 120 degrees C. The sealing parameters were optimized through response surface methodology that makes the process capable for further development regardless of device size
Daniel Nieto - One of the best experts on this subject based on the ideXlab platform.
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single pulse laser ablation threshold of borosilicate fused silica sapphire and soda Lime Glass for pulse widths of 500 fs 10 ps 20 ns
Applied Optics, 2015Co-Authors: Daniel Nieto, Gerard M Oconnor, Justo Arines, M T FloresariasAbstract:In this work, we report a comparative study of the laser ablation threshold of borosilicate, fused silica, sapphire, and soda-Lime Glass as a function of the pulse width and for IR laser wavelengths. We determine the ablation threshold for three different pulse durations: τ=500 fs, 10 ps, and 20 ns. Experiments have been performed using a single laser pulse per shot in an ambient (air) environment. The results show a significant difference, of two orders of magnitude, between the group of ablation thresholds obtained for femtosecond, picosecond, and nanosecond pulses. This difference is reduced to 1 order of magnitude in the soda-Lime substrate with tin impurities, pointing out the importance of the incubation effect. The morphology of the marks generated over the different Glass materials by one single pulse of different pulse durations has been analyzed using a scanning electron microscope (FESEM ULTRA Plus). Our results are important for practical purposes, providing the ablation threshold data of four commonly used substrates at three different pulse durations in the infrared regime (1030–1064 nm) and complete data for increasing the understanding of the differences in the mechanism’s leading ablation in the nanosecond, picosecond, and femtosecond regimes.
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fabrication of microlens arrays on soda Lime Glass using a laser direct write technique and a thermal treatment assisted by a co2 laser
Optics and Lasers in Engineering, 2015Co-Authors: Tamara Delgado, Daniel Nieto, M T FloresariasAbstract:Abstract A low-cost method for fabricating microlens arrays on commercial soda-Lime Glass is presented. The hybrid technique is composed by a laser direct writing technique and a laser assisted post-thermal treatment. In particular we use a nanosecond Q-Switch Nd:YVO 4 laser for fabricating the initial structure of microposts on soda-Lime Glass substrates and a CO 2 laser combined with a furnace for reshaping and improving its morphological and optical qualities. This new fabrication approach lets us obtain a high quality microlenses array with a diameter of 50 μm, sag 1.5 μm, focal length 1 mm and a spot size of 7.8 μm. Furthermore, the proposed technique preserves the advantages of the laser direct-write technique in terms of design flexibility, simplicity, fast prototyping, low cost and so on; while the alternative laser assisted thermal treatment lets us overcome the bounding problems presented in other conventional thermal treatments.
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fabrication of microchannels on soda Lime Glass substrates with a nd yvo4 laser
Optics and Lasers in Engineering, 2014Co-Authors: Daniel Nieto, Tamara Delgado, M T FloresariasAbstract:Abstract A new method for fabricating microchannels for microfluidic applications on soda-Lime Glass has been developed. It consists of a combination of a laser direct write technique for fabricating the microchannels and a thermal treatment for reshaping and/or improving the morphological qualities of the generated microchannels. The proposed technique allows us to obtain microchannels with a minimum diameter of 8 µm and 1.5 µm of depth. A decrease of two orders of magnitude of the average roughness generated after the laser ablation, reaching values of the order of the unprocessed Glass, has been obtained thanks to the thermal treatment. The use of pulsed nanosecond lasers for the laser direct write presents the benefits of using lasers commonly implemented in the industry for laser processing of materials. This fact makes the technique presented highly competitive compared with others used for Glass microstructuring.
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fluence ablation threshold dependence on tin impurities in commercial soda Lime Glass
Applied Optics, 2014Co-Authors: Daniel Nieto, Justo Arines, M T FloresariasAbstract:In this paper, we study the reduction in the fluence ablation threshold induced by tin impurities incorporated in float soda-Lime Glass during the fabrication process. The laser system used in the experiments was a Nd:YVO4 laser operating at 1064 nm with a pulse duration of 20 ns. The fluence ablation thresholds found were 112 J/cm2 for the tin side and 920 J/cm2 for the tin-free side, which means a reduction of nearly 1 order of magnitude. The fluence ablation threshold reduction permits the manufacturing of narrower grooves with small level of roughness, obtaining quality elements in low-cost soda-Lime substrates.
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laser direct write technique for fabricating microlens arrays on soda Lime Glass with a nd yvo4 laser
Applied Optics, 2010Co-Authors: Daniel Nieto, Gerard M Oconnor, Teresa M Floresarias, Carlos GomezreinoAbstract:A one-step direct-write technique for fabricating spherical microlenses on soda-Lime Glass substrates is described. Using a Q switched Nd:YVO4 laser combined with a galvanometer system, square and triangular microlens arrays were fabricated. The focal length of microlenses is measured using direct and nondirect methods. Values around 118 and 125µm were obtained for the microlens focal length of square and triangular arrays, respectively. A noncontact profilometer is used for determining the surface roughness of square and triangular arrays. Results are compared with that of Glass substrate.
Seyedali Emami - One of the best experts on this subject based on the ideXlab platform.
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low temperature hermetic laser assisted Glass frit encapsulation of soda Lime Glass substrates
Optics and Lasers in Engineering, 2017Co-Authors: Seyedali Emami, Joaquim Mendes, Luisa Andrade, Jorge Martins, Adélio MendesAbstract:Abstract Room temperature and low temperature (120 °C) laser-assisted Glass frit bonding of soda-Lime Glass substrates are accomplished in this work. The locally laser melted bonding showed hermeticity with helium leak rate of −8 atm cm 3 s −1 , maintaining its leak rate even after standard climatic cycle tests. Small size devices were bonded at room temperature while larger areas were sealed at the process temperature of 120 °C. The sealing parameters were optimized through response surface methodology that makes the process capable for further development regardless of device size.
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Low temperature hermetic laser-assisted Glass frit encapsulation of soda-Lime Glass substrates
'Elsevier BV', 2017Co-Authors: Seyedali Emami, Joaquim Mendes, Luisa Andrade, Jorge Martins, Adélio MendesAbstract:Room temperature and low temperature (120 degrees C) laser-assisted Glass frit bonding of soda-Lime Glass substrates are accomplished in this work. The locally laser melted bonding showed hermeticity with helium leak rate of < 5 x 10(-8) atm cm(3) s(-1), maintaining its leak rate even after standard climatic cycle tests. Small size devices were bonded at room temperature while larger areas were sealed at the process temperature of 120 degrees C. The sealing parameters were optimized through response surface methodology that makes the process capable for further development regardless of device size
J S Moya - One of the best experts on this subject based on the ideXlab platform.
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mechanical performance of a biocompatible biocide soda Lime Glass ceramic
Journal of The Mechanical Behavior of Biomedical Materials, 2014Co-Authors: Sonia Lopezesteban, Ramón Torrecillas, Jose F Bartolome, L A Di, Leticia Estebantejeda, Catuxa Prado, R Lopezpiriz, J S MoyaAbstract:Abstract A biocompatible soda–Lime Glass-ceramic in the SiO 2 –Na 2 O–Al 2 O 3 –CaO–B 2 O 3 system containing combeite and nepheline as crystalline phases, has been obtained at 750 °C by two different routes: (i) pressureless sintering and (ii) Spark Plasma Sintering. The SPS Glass-ceramic showed a bending strength, Weibull modulus, and toughness similar values to the cortical human bone. This material had a fatigue limit slightly superior to cortical bone and at least two times higher than commercial dental Glass-ceramics and dentine. The in vitro studies indicate that soda–Lime Glass-ceramic is fully biocompatible. The in vivo studies in beagle jaws showed that implanted SPS rods presented no inflammatory changes in soft tissues surrounding implants in any of the 10 different cases after four months implantation. The radiological analysis indicates no signs of osseointegration lack around implants. Moreover, the biocide activity of SPS Glass-ceramic versus Escherichia coli , was found to be >4 log indicating that it prevents implant infections. Because of this, the SPS new Glass-ceramic is particularly promising for dental applications (inlay, crowns, etc).
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Mechanical performance of a biocompatible biocide soda-Lime Glass-ceramic
Journal of the mechanical behavior of biomedical materials, 2014Co-Authors: Sonia López-esteban, Ramón Torrecillas, Jose F Bartolome, Catuxa Prado, Leticia Esteban-tejeda, R. López-piriz, J S MoyaAbstract:Abstract A biocompatible soda–Lime Glass-ceramic in the SiO 2 –Na 2 O–Al 2 O 3 –CaO–B 2 O 3 system containing combeite and nepheline as crystalline phases, has been obtained at 750 °C by two different routes: (i) pressureless sintering and (ii) Spark Plasma Sintering. The SPS Glass-ceramic showed a bending strength, Weibull modulus, and toughness similar values to the cortical human bone. This material had a fatigue limit slightly superior to cortical bone and at least two times higher than commercial dental Glass-ceramics and dentine. The in vitro studies indicate that soda–Lime Glass-ceramic is fully biocompatible. The in vivo studies in beagle jaws showed that implanted SPS rods presented no inflammatory changes in soft tissues surrounding implants in any of the 10 different cases after four months implantation. The radiological analysis indicates no signs of osseointegration lack around implants. Moreover, the biocide activity of SPS Glass-ceramic versus Escherichia coli , was found to be >4 log indicating that it prevents implant infections. Because of this, the SPS new Glass-ceramic is particularly promising for dental applications (inlay, crowns, etc).
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the antibacterial and antifungal activity of a soda Lime Glass containing silver nanoparticles
Nanotechnology, 2009Co-Authors: Leticia Estebantejeda, Francisco Malpartida, Antonio Estebancubillo, Carlos Pecharroman, J S MoyaAbstract:A low melting point soda-Lime Glass powder containing copper nanoparticles with high antibacterial (against gram-positive and gram-negative bacteria) and antifungal activity has been obtained. Sepiolite fibres containing monodispersed copper nanoparticles (d50?30 ? 5?nm) were used as the source of the copper nanoparticles. The observed high activity of the obtained Glass powder, particularly against yeast, has been explained by considering the inhibitory synergistic effect of the Ca2+ lixiviated from the Glass on the growth of the colonies.