- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Design and Analysis of a Dispersion-engineered and Highly Nonlinear Rib Waveguide for Generation of Broadband Supercontinuum Spectra
摘要： In this paper, a waveguide consisting of a core of As2Se3 chalcogenide glass and the upper and lower claddings of MgF2 with two zero-dispersion wavelengths (ZDW) has been proposed. By optimization of the dimensions of the core and the claddings, their effects on the dispersion curve have been investigated and a suitable structure with a flat dispersion curve, an effective mode area of 1.6 μm2 in a pump wavelength of 2.8 μm, and hence, a nonlinear coefficient greater than 34 w?1 m?1 has been obtained. A broadband supercontinuum in a wavelength range of 1.5 μm to 15 μm has been generated by applying an input pulse with duration of 100 fs and a maximum power of 2 kw to this waveguide. Due to the large width of the supercontinuum generated (SCG), the short length of the waveguide (maximum 5 mm), and a low input power, this structure is suitable for use in optical integrated circuits and its various applications.
关键词： zero dispersion wavelength,supercontinuum generation,high nonlinearity,chalcogenide glass,low loss,rib waveguide
更新于2025-09-12 10:27:22
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Cr,Fe:ZnMnSe Laser Excited by Flash-Lamp Pumped Er:Glass Laser
摘要： Due to the wide use of coherent radiation in the mid-infrared (IR) region, the attention has been paid to both direct and indirect methods of generation of this radiation over the past two decades. While indirect methods are based on nonlinear conversion (OPOs or Raman scattering), the direct approach looks for a new active media that will allow generation of radiation in the mid-IR region in a single step [1]. It has been found that by replacing Zn2+ ions with Mn2+, Mg2+ or Cd2+ ions with comparable size in the ZnSe matrix, the position of the absorption and emission bands is shifted to the longer wavelengths by increasing concentration of these ions substitution [1, 2]. It allows a one laser oscillator to extend or to shift the emission spectrum further to the mid-IR part of the electromagnetic spectrum, which was previously exclusively based on the nonlinear processes or on the parametric generation.
关键词： Cr,mid-infrared,laser,spectral properties,Er:glass laser,Fe:ZnMnSe
更新于2025-09-12 10:27:22
-
Preparation of novel lead-free Ag-doped glass frit for polycrystalline silicon solar cells by sol-gel method
摘要： A novel Ag-doped glass frit is prepared by the sol-gel method. Nitrogen adsorption-desorption isotherms indicate that the frit has a large BET surface area and a small particle size which promotes front contact metallization. When the glass frit is used for the front contact electrode of polycrystalline silicon solar cells (pc-Si solar cells), it exhibits excellent wettability and etching results on the SiNx layer and the Si substrate. The pc-Si solar cells with the as-prepared frit has a better photoelectric conversion efficiency (18.2%) and is 0.8% higher than the solar cells using the conventional frit, which is due to the frit will produce a lot of Ag nanocrystals at the interface of the glass layer, promoting the formation of excellent ohmic contact between the Ag electrode and n-Si layer, and reducing the contact resistance of solar cells.
关键词： Ag-doped glass frit,polycrystalline silicon solar cells,photoelectric conversion efficiency,sol-gel method
更新于2025-09-12 10:27:22
-
Additive manufacturing of glass: CO2-Laser glass deposition printing
摘要： Additive manufacturing is used in several industrial sectors where polymers and metals are established materials. Different academic studies prove that additive manufacturing methods can be applied on glass materials using powder or fiber based material sources. In terms of quartz glass, with melting temperatures around 2200°C, laser sources are used to achieve the necessary intensities. In the present study, additive manufacturing of quartz glass is achieved by melting a quartz glass fiber with a CO2 laser source. A combined laser head focusses the laser radiation onto the glass fiber in order to melt the fiber. A three axis system is used to move the printing stage and glass substrate. The experimental investigations show that CO2-laser glass deposition printing allows for the creation of arbitrary 3D quartz glass structures. This method is envisioned to replace conventional manual glass manufacturing processes for production of complex hollow glass structures which are present in the medical sector.
关键词： Additive manufacturing,glass,laser
更新于2025-09-12 10:27:22
-
Thin water film assisted glass ablation with a picosecond laser
摘要： Ultrashort lasers have become a promising tool for fast and high quality cutting of glasses. However, growing industry constantly seek for higher production throughput maintaining excellent process quality. In most cases, glass processing speed is limited to avoid clogging the laser-ablated channel, minimize crack generation, and heat accumulation effects in the glass material. Studies have shown that the introduced water layer onto the surface of the workpiece can significantly improve laser throughput and processing quality. This paper investigates laser ablation of soda-lime glass sheets in ambient air and water-assisted conditions. Glass cutting and single scan groove ablation were investigated in spite of ablation efficiency and scribe morphology. A 532 nm laser working at 100 kHz repetition rate was utilized in the experiments. Results showed that the applied thin flowing water film on the sample’s surface improved the glass ablation efficiency by 12 times.
关键词： thin-film,cutting,glass,water,Laser
更新于2025-09-12 10:27:22
-
Nonlinear absorption dynamics simulated in internal modification of glass at 532nm and 1064nm by ultrashort laser pulses
摘要： Dynamic ionization process at high pulse repetition rate is analysed based on the model consisting of rate equation for free-electrons, Gaussian beam propagation equation, thermal conduction and thermal ionization, showing the plasma generated near the geometrical focus moves toward the laser source periodically by the contribution of avalanche ionization. The effects of laser wavelength on the ionization process are discussed by comparing the contributions of multiphoton ionization and avalanche ionization. The crack tendency of 532nm and 1064nm is also compared between single pulse and multipulse irradiation.
关键词： thermal conduction model,nonlinear ionization process,glass,internal modificatin,thermal ionization,crack,ultrashort laser pulses
更新于2025-09-12 10:27:22
-
Influence of Er,Cr:YSGG Laser Irradiation on the Push-Out Bond Strength of Zirconia and Glass Fiber Posts with Radicular Dentin
摘要： Objective. This in vitro study was designed to evaluate the influence of an Er,Cr:YSGG laser on the bond strength of zirconia and glass fiber posts with root dentin. Materials and methods. Ninety extracted single-rooted human teeth were randomized into 6 groups (n = 15/group) on the basis of different posts (zirconia/glass fiber) and Er,Cr:YSGG laser tips (axial and radial). Specimens were prepared for push-out testing with the help of a cutting machine; six slices (2 on each cervical, middle, and apical) of approximately 1 mm thickness were sectioned for all roots on a plane perpendicular to the long axis of the post. All specimens were placed into a universal testing machine with a defined 0.5 mm/min crosshead speed until the maximum failure load was obtained. Results. The highest mean push-out bond strength of the glass fiber and zirconia groups was achieved with laser treatment. The highest push-out bond strength was achieved with the axial fiber tip (7.63 ± 1.22 MPa), and the lowest was achieved with a radial fiber tip of the glass fiber group (6.98 ± 0.96 MPa). ANOVA showed a statistically significant difference between the groups (p ? 0.041). The mean push-out bond strength was found to be higher with an axial fiber tip for both cervical and apical segments in the glass fiber and zirconia groups (p < 0.05). The independent t-test resulted in the overall highest mean push-out bond strength in the apical segments (p ? 0.026). Conclusion. Within the limits of the present in vitro research study, an enhancement in the push-out bond strength of resin cement, mainly in the cervical region of the root canal, was achieved after irradiation with an Er,Cr:YSGG laser using an axial fiber tip.
关键词： root dentin,push-out bond strength,Er,Cr:YSGG laser,glass fiber posts,zirconia posts
更新于2025-09-12 10:27:22
-
Rare-earth element doping in glass frit for improved performance in silicon solar cells
摘要： Glass frit plays an important role in the silver paste for silicon solar cells. In this work, we prepare glass frit doped with different rare-earth elements (Y, La, Sm, Er) and study how the doping element affects the performance of the solar cells. Solar cells with La-doped and Sm-doped glass frits show average conversion efficiencies higher than 17.5%, while solar cells with Y-doped or Er-doped frit show lower efficiencies. By analyzing the Raman spectra of the rare-earth doped glass frits, we find that the average coordination number of Te–O (NTe(cid:1)O) in the glass can be tuned by the rare-earth dopant. La or Sm doping leads to a moderate value of NTe(cid:1)O, which is believed to achieve a glass formation ability that optimizes the structure of the Ag–Si interface of the cell for the best performance.
关键词： rare-earth elements,glass frit,Solar cells,Raman spectra
更新于2025-09-12 10:27:22
-
Reducing parasitic absorption and recombination losses in silicon solar cells through transition metal doped glass frit
摘要： Efficient electron selective contacts, smoother rear silicon surface and passivation of silicon-electrode interfaces could reduce parasitic light absorption and electron-hole recombination. Therefore, they are necessary for high conversion efficiency in silicon solar cells. In this work, a novel transition metal doped glass frit is fabricated and introduced into pristine Al paste. As a result, the average power conversion efficiency (PCE) of cells is improved from 17.9 to 18.3%. Combining several results, the improvement can be attributed to three key factors: (a) a thicker back surface field (BSF) layer that blocks electrons; (b) a smoother rear silicon surface which leads to less parasitic absorption; and (c) glass frit coating on aluminum particles which may facilite hole-transfer from silicon layer to aluminum electrode.
关键词： Al paste,glass,BSF,recombination,parasitic absorption
更新于2025-09-12 10:27:22
-
Silver Nanoparticles Enhanced Luminescence and Stability of CsPbBr <sub/>3</sub> Perovskite Quantum Dots in Borosilicate Glass
摘要： Series of silver nanoparticles (NPs) embedded CsPbBr3 quantum dots (QDs) glass was synthesized via the melt-quench method. Ag NPs and CsPbBr3 QDs coexist in the TEM image of the Ag-doped glass sample. Photoluminescence (PL) spectra show that the 0.1 molar ratio Ag2O doped sample had a PL intensity 2.37 times than the undoped sample. This increase is generated by localized surface plasmon resonance coupling between the Ag NPs and CsPbBr3 QDs. Excessive Ag doping weakens the PL intensity due to spectral self-absorption of the Ag NP surface plasmon resonance (SPR). Self-adsorption of SPR is detrimental to luminescence properties because it increases the amount of photogenerated charge carriers which proceed through non-radiative relaxation pathways. In addition, stability results of Ag NP doped-CsPbBr3 QD glass show that they have excellent stability. This study on Ag NP doped-CsPbBr3 QD glass provides a new idea for the future development of perovskite QD optoelectronic devices.
关键词： Borosilicate glass,CsPbBr3 perovskite quantum dots,Luminescence,Stability,Silver nanoparticles
更新于2025-09-12 10:27:22