Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 56 for “"Laser processing"”.
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Laser Processing of Metals and Polymers
<p>A laser offers a unique set of opportunities for precise delivery of high quality coherent energy. This energy can be tailored to alter the properties of material allowing a very flexible adjustment of the interaction that can lead to melting, vaporization, or just surface modification. Nowadays …
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Laser Processing of Polyimide on Copper
While work using a laser for processing a polymer dielectric is currently being studied, the purpose of this thesis is to present an effective and economical approach using laboratory equipment that is most commonly used and available for the processing of materials including polymers and metals. …
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PULSED LASER PROCESSING FOR HIGH EFFICIENCY SILICON WAFER SOLAR CELLS
Laser technology has become one of the commonly applied techniques for high-efficiency silicon wafer solar cell fabrication. In order to incorporate laser processing technology in high efficiency solar cell fabrication, laser induced material damage has to be minimized or even eliminated. This …
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Laser processing of solution based antimony doped tin oxide thin films
… conventional high temperature annealing, excimer laser processing can provide highly localized energy dissipation, and is an attractive technique to functionalise coated materials. Therefore the work presented in this thesis investigates the use of excimer laser processing to optimise the …
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Growth optimisation and laser processing of thin film phosphors for electroluminescent displays
… phosphor growth optimisation and post deposition processing in order to strengthen development of novel TFEL devices. To achieve this, thin films of phosphor were deposited using RF magnetron sputtering to investigate the use of co-sputtering in order to optimise dopant concentration. 800 nm films …
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Nanosecond Pulsed Laser Processing of Metals and Welding of Metal-Glass Nanocomposites
In this thesis, nanosecond pulsed lasers are used as the tools to generate microstructures on metal and glass. The applications of these structures are described too. The production of micro structures is demonstrated using diode-pumped solid state (DPSS) Nd:YVO4 lasers operating at wavelengths of …
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Laser Processing of Materials for the Energy Transition. Applications to Fuel Cell Technologies
L'abstract è presente nell'allegato / the abstract is in the attachment
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Evaluating the use of laser processing and polishing techniques to generate micro-patterned surfaces for controlling fibroblast cell behaviour
… the use of MTT assays and live cell tracking. Laser processing in a directional manner resulted in polyurethane surfaces having a ploughed field effect with micron-scale features a novel surface. In contrast, abrasive polishing in a directional and random manner resulted in polyurethane …
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ULTRA-FAST LASER ENHANCED PRINTING OF NANOMATERIAL FOR HIGH QUALITY TRANSPARENT ELECTRODE
… conductive electrode (TCE) film. Following laser processing is utilized as the post treatment to enhance the film performance. The laser processing is proposed in order to weld nanomaterials in nanoscale and enhance the electrical conductance of the nanomaterials film after direct printing. …
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Characterization of particles created by laser-driven hydrothermal processing
This study examined particles created by laser-driven hydrothermal processing, an innovative technique used for the ablation of submerged materials. Two naturally occurring materials, obsidian and tektite, were used as targets for this technique. Characterization of sample materials before and …
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Wear Mechanism/microstructure Relationships for Laser Processed Cast Iron (Erosion, Abrasion, Martensite, Transformation)
… are to (1) investigate the potential for CO(,2) laser processing to produce novel, non-equilibrium surface microstructures in cast iron and (2) investigate the basic wear mechanisms of these non-equilibrium microstructures. Three kinds of microstructures can be produced by this laser processing. …
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Laser surface modification of steel
The presented work is an investigation of the laser surface modification of H13 tool steel using pulse laser processing mode. Initial screening experimental designs conducted lead to more optimised detailed designs. A carbon dioxide (CO2) laser system with 10.6 μm wavelength was used. In the …
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Laser Surface Texturing, Crystallization and Scribing of Thin Films in Solar Cell Applications
… and numerical analysis of the influences of laser processing on microstructure, optical and electrical properties of two absorber materials, a-Si:H (hydrogenated amorphous silicon) and CdTe (cadmium telluride). a-Si:H thin film solar cells suffer from disadvantages of low efficiencies and …
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Crack Tip Micromaching by Femtosecond Laser for Fracture Testing of Metal Laminates
… experimental study of the effects of ultrafast laser ablation on the mechanical properties of metal laminates followed by FEA simulation to elucidate future experimental potential. The metals investigated are copper, niobium, and copper/niobium accumulative roll bonded (ARB) laminates. The two …
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DIAGNOSTICS AND REAL-TIME MONITORING OF PULSED LASER ABLATION
… and real-time monitoring during pulsed laser ablation of solid materials are investigated. It is found that acoustic, optical and electric signals generated are closely related to laser processing conditions, material surface and bulk properties. A wide band microphone is used to record …
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Examining ablation efficiency in alumina ceramics utilizing femtosecond laser with mhz/ghz burst regime /
… the electronics industry, and others. Ceramic processing commonly involves mechanical processes such as milling, drilling, and cutting. Unfortunately, mechanical processing has several drawbacks: tool wear, expensive tools required for material processing, and limited processing accuracy. Laser …
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Ultrafast Machining of High Temperature Superconducting Nanostructures for Novel Mesoscale Physics
… mechanical scribing, and focussed ion beam, laser machining of YBCO has been continuously studied since 1988 due to its design flexibility and the absence of chemicals. One thing that is still not adequately understood is the nature of laser induced damage on YBCO, and to what proportion it …
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Approximate solution of melt depth inside titanium during laser materials processing
The use of lasers has increased in areas of science, engineering and medicine. Their advantages over the traditional methods of thermal application are their ability to localize thermal treatments, ability to deliver high power density and to complete thermal processes in extremely short time …
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Stroboscopic Inline Coherent Imaging
… is an in-situ monitoring technique, used in laser processing applications such as welding and additive manufacturing. Conventional ICI systems image with a continuous-wave broadband light source, which makes the system susceptible to an effect known as motion artifact. Motion artifact occurs …
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