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Leak in the curved suction contact glass of a femtosecond laser during small-incision lenticule extraction
摘要： We report a case of a leak in the curved suction contact glass of a VisuMax femtosecond laser that occurred during small-incision lenticule extraction (SMILE). As a result, creation of the anterior surface of the lenticule was not complete. One month later, a cap was created using the flap mode; the flap side cut was manually stopped after the flap cut was made. After laser in situ keratomileusis flap creation, the refractive lenticule was manually removed using microforceps, similar to the uneventful SMILE procedure. To our knowledge, this is the first report of a leak in the curved suction contact glass during SMILE that was successfully treated.
关键词： femtosecond laser,small-incision lenticule extraction,leak,suction contact glass,SMILE
更新于2025-09-12 10:27:22
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Precipitating CsPbBr <sub/>3</sub> quantum dots in boro-germanate glass with a dense structure and inert environment toward highly stable and efficient narrow-band green emitters for wide-color-gamut liquid crystal displays
摘要： All-inorganic perovskite CsPbBr3 quantum dots (QDs) are becoming the most popular narrow-band green emitter for use as a critical material in next generation wide-color-gamut backlight displays. However, their intrinsic poor stability greatly hinders their development for practical applications. Herein, CsPbBr3 QDs were successfully precipitated in boro-germanate glass (CsPbBr3 QDs@glass) with well-designed compositions, not only retaining a high photoluminescence quantum yield (PLQY of 43% upon 450 nm excitation) and narrow bandwidth (FWHM of 22 nm), but also showing significantly enhanced stability in relation to water, heat, and UV/blue irradiation. The relative PL intensity of CsPbBr3 QDs@glass was maintained at 60% or 85% after being immersed in water for 22 days or exposed to UV light for 100 hours, respectively. Moreover, CsPbBr3 QDs@glass samples present impressive recovery abilities in thermal cycling experiments or upon intermittent blue light irradiation. Finally, an all-inorganic white light-emitting diode (white LED) achieving 125% of National Television Standards Committee (NTSC) performance was fabricated through employing green-emitting CsPbBr3 QDs@glass and red-emitting Cs2SiF6:Mn4+ phosphor-in-glass (PiG) plates as color convertors. The design rules established here could initiate the further exploration of other glass systems with moderate halide solubilities and low melting temperatures to precipitate highly e?cient and stable CsPbX3 (X = Cl, Br, I) QDs.
关键词： stability,boro-germanate glass,CsPbBr3 quantum dots,wide-color-gamut liquid crystal displays,narrow-band green emitters
更新于2025-09-12 10:27:22
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Nanoparticles in Optical Waveguides: A Toolbox to Promote Lasers, Amplifiers and Sensors
摘要： The success of glass photonics are many, with a large spectrum of applications covering Information and Communication Technology, Health and Biology, Structural Engineering, and Environment Monitoring Systems, etc. A paradigmatic example is the development of the Erbium-Doped Fiber Amplifier (EDFA) allowing the raise of optical telecommunications and high speed internet. Silica glass is the most common glass used for photonics applications. However, certain of its characteristics may be detrimental for luminescence properties (low rare-earth solubility, high phonon energy, etc). To overcome these limitations, the use of nanoparticles in optical waveguides has gained large interest in modern photonic technology nowadays. Such waveguides would combine the advantages of silica (transparency, cost, chemical and mechanical durability, etc.) and the specific properties provided by the nanoparticles which encapsulate the rare-earth ions. In this paper, we discuss on the opportunities offered by the nanoparticles addition in glasses for lasers and amplifiers thanks to the engineering of the spectroscopic properties. We present also an emerging application: sensors based on high scattered fibers.
关键词： amplifiers,sensors,glass,nanoparticles,waveguides,lasers
更新于2025-09-12 10:27:22
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AIP Conference Proceedings [AIP Publishing INTERNATIONAL SYMPOSIUM ON GREEN AND SUSTAINABLE TECHNOLOGY (ISGST2019) - Perak, Malaysia (23–26 April 2019)] INTERNATIONAL SYMPOSIUM ON GREEN AND SUSTAINABLE TECHNOLOGY (ISGST2019) - Effects of constituents in paste on low light performances of silicon solar cells
摘要： Solar cell performances at low light intensity are practically more important for power generation capacity in the entire life cycle. Previous studies have revealed that efficiency and maximum power of the solar cells with low shunt resistance become lower at the low light intensity. In contrast, our study has demonstrated the effects of paste or glass frit as paste constituents on shunts and recombination, as well as open-circuit voltage of solar cells with floating contact method. However, the effects of the glass frit in the paste on the low light performances of the cells have not been actually clear yet. For this reason, in this study, the effects of the glass frit itself on the low light performances of the cells are investigated. This is because even though the glass frit is an indispensable constituent for silver paste to electrically contact to the solar cells, the effects of the glass frit itself on cell performance have not been clear yet. In conclusion, the glass frit itself makes the solar cell performances lower at the low light intensity, especially open-circuit voltage and fill factor, by causing shunts and recombination, which means that the effects of paste constituents on shunts and recombination are important not only for solar cell performances at 1 sun, but also for the performances at low light intensity.
关键词： low light performances,recombination,paste constituents,silicon solar cells,glass frit,shunts
更新于2025-09-12 10:27:22
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Femtosecond-Laser-Induced Precipitation of CsPbBr3 Perovskite Nanocrystals in Glasses for Solar Spectral Conversion
摘要： Inorganic perovskite quantum dots (QDs) and nanocrystals (NCs) have attracted much attention in recent years because of their high photoluminescence quantum yield (PL QY), narrow full width at half maximum, and wide tunability cross the whole visible range. In this work, space- and size-controlled precipitation of CsPbBr3 perovskite NCs was realized through femtosecond laser direct writing method. Precipitation of CsPbBr3 NCs in glasses was confirmed by the energy dispersive spectroscopy, transmission electron microscope analysis and photoluminescence (PL). Growth of CsPbBr3 perovskite NCs in glass was modulated by fs laser irradiation parameters such as repetition rate, pulse energy, and scanning rate, and PL in the range spanning from blue to green was achieved. With well-designed arrangement of CsPbBr3 NCs and the reduction of self-absorption emission, solar concentrator fabricated by fs laser irradiation can realize the spectral conversion and enhance the quantum efficiency of solar cells.
关键词： Glass,All-inorganic perovskite,Spectral conversion,Solar concentrator,Femtosecond laser,Photoluminescence,CsPbBr3,Nanocrystals
更新于2025-09-12 10:27:22
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Comprehensive analysis of blue diode laser-annealing of amorphous silicon films
摘要： The low temperature polycrystalline silicon (LTPS) method has proved to be a technical breakthrough, accomplishing semiconductor thin films with remarkable mobility for a range of high-performance displays, including liquid crystal display and organic light emitting diodes. However, utilizing a conventional excimer laser source for LTPS incurs high cost. In this paper, we demonstrate a comprehensive analysis of the crystallization mechanism of a-Si film (94 nm) and the thermal deformation of the glass substrate induced by Blue diode Laser Annealing (BLA). BLA provides high quality laterally grown crystals over 4 μm × 10 μm on glass substrates, which were examined by optical microscopy, scanning electron microscopy, and Raman spectroscopy. In addition, the permanent deformation introduced by the annealing process is numerically modeled, instantiating how to control the heat conduction from the thin film that affects the substrate. Our findings reveal that the permanent thermal deformation depth that can be obtained is comparable to the roughness of the silicon film for the optimum scanning speed and laser power. The combination of both experimental and numerical results elucidates the manifested physical mechanisms during the BLA process and provides the guidelines to improve the experimental parameters of this process.
关键词： Lateral grain growth,Glass deformation,Silicon thin film,Low Temperature Polycrystalline Silicon (LTPS),Blue diode laser
更新于2025-09-12 10:27:22
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Heat-Affected Zone Investigation During the Laser Beam Drilling of Hybrid Composite Using Statistical Approach
摘要： In the present work, basalt–glass hybrid composite has been fabricated and machined using laser beam drilling, to predict a safe machining zone pertaining to high drill quality with minimum heat-affected zone and maximum hole circularity. The prediction of the zone has been done by mathematical modeling using response surface methodology. The obtained zone has also been validated by performing more experiments. Moreover, the dependency of hole circularity and heat-affected zone on input parameters has also been discussed. From the results, it is evident that the obtained zone is capable of minimizing the heat-affected zone with acceptable hole circularity. Moreover, the behavior of input parameters is non-monotonic in nature.
关键词： Precise drilling,Heat-affected zone,Basalt–glass composite,Hybrid composite
更新于2025-09-12 10:27:22
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Luminescent properties of calcium-alumino-silicate glasses (CaAlSi) doped with Sm2O3 and co-doped with Sm2O3?+?Eu2O3 for LED glass applications
摘要： A new glass system of calcium-alumino-silicate doped with Sm2O3 and co-doped with Sm2O3 ± Eu2O3 was fabricated in order to improve the efficiency of the red emission for phosphor glass materials. The optical properties of the glass samples were studied by measurements using UV–vis absorption spectra and excitation energy. The results showed that 403 nm of photon energy is effective to elevate the electron in a ground state to an excited state. This photon energy was used to study the emission spectra and energy transfer. The luminescence intensity O/R ratio of the glass samples showed a stronger red shift colour with an increase in the dopants. Moreover, the quantum yield (QY) of the glass samples was measured, and the results showed that Eu2O3 can increase the QY by acting as activator. These results indicate that the glass samples are a good potential candidate for LED applications.
关键词： Sm3+,Glass,Decay times,Luminescence properties,Eu3+
更新于2025-09-12 10:27:22
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Impurities in large scale produced Nd-doped phosphate laser glasses. I. Cu ions
摘要： Impurity ions such as transition metals and rare earth metals in Nd-doped phosphate laser glasses will degrade Nd-laser performance, among which Cu is the most harmful. Divalent Cu2+ not only results in an optical loss at Nd-laser wavelength, but also reduces the energy storage for laser amplification. A large-scale production of Nd-doped phosphate laser glasses is required to meet quality demand and to realize economy of scale. To balance between the controlled impurity level in the glasses and the cost of raw materials for thousands of disks of meter-scale Nd-doped phosphate laser glasses, it is important to determine an upper limit for Nd-laser degradation due to divalent Cu2+ ions. The absorption edge of Cu singly-doped phosphate glass prepared in an oxidizing atmosphere shows the evidence of monovalent Cu+. X-ray photoelectron spectroscopy is utilized to further verify the existence of monovalent Cu+ ions in Cu, Nd codoped phosphate glass. The results show that both Cu+ and Cu2+ ions most probably coexist in Nd-doped phosphate laser glasses produced in the oxidizing atmosphere to eliminate Pt inclusions in the glasses. Accordingly, this paper discusses the extinction coefficient and the fluorescence quench factor caused by divalent Cu2+ ions, as well as their influence.
关键词： Cu2+,fluorescence quench factor,optical loss,Cu+,Nd-doped phosphate laser glass,XPS
更新于2025-09-12 10:27:22
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Surface resonance properties of pure Cu and Cu80Zr20 metallic glass films with nanoparticles induced by pulsed-laser dewetting process
摘要： Pure Cu and Cu80Zr20 thin films with a thickness of 10 nm were deposited on glass substrates using a high-vacuum sputtering system. A pulsed-laser dewetting process was then performed using a NIR laser system. For the pure Cu film, nanoparticles were produced for the accumulated energy (AE) densities in the range of 0.6~11 J/cm2. The particle size was found to increase with increasing scanning speed and repetition rate, and with decreasing power. For the Cu80Zr20 thin film, nanoparticles were formed under all AE values under consideration. The nanoparticles consisted almost entirely of Cu; with the Zr atoms being repelled to the bottom of the nanoparticle and surroundings. The optical absorption peak wavelengths for the Cu and Cu80Zr20 films produced under different dewetting conditions all lay in the range of 580~700 nm. Hence, it was inferred that the nanoparticles produced in the two films had a similar size, shape and composition.
关键词： surface resonance properties,Pulsed-laser dewetting,metallic glass,nanoparticle
更新于2025-09-12 10:27:22