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 20 for “"Laser micromachining"”.
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Polymers for KrF 248 nm Nanosecond Laser Micromachining
… to the krypton fluoride (KrF) 248 nm nanosecond laser micromachining. Chapter 2 covers preliminary research into the laser micromachining of eleven different kinds of commercial plastic films with different chemical structures and thermal properties. Chapters 3 and 4 discuss the synthesis and …
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Laser micromachining of active and passive photonic integrated circuits
This thesis describes the development of advanced laser resonators and applications of laser-induced micromachining for photonic circuit fabrication. Two major advantages of laser-induced micromachining are direct patterning and writing on large areas of substrates at high speed following the …
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Laser Micromachining: An Enabling Technology for Functional Surfaces and Materials
L'abstract è presente nell'allegato / the abstract is in the attachment
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Ultrafast Laser Micromachining for Correction of Thin Optics for Next Generation X-ray Space Telescopes
… is the development of implementing ultrafast laser micromachining technology to the correction of thin-shell lightweight high-resolution mirrors for future high performance X-ray space telescopes. The existing fabrication methods cannot achieve the required accuracy for individual mirror …
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Design, simulation, and testing of a low cost laser micromachining system for flexible and rapid tissue-on-chip fabrication.
… device fabrication using low-cost picosecond laser ablation, addressing critical limitations in current manufacturing methods such as soft lithography, particularly in terms of material compatibility, feature resolution, and scalability. We developed a comprehensive finite element method (FEM) …
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Developing a Multi-axis Femtosecond Laser Micromachining Platform for Laser Induced Refractive Index Modification: Fiber Bragg Gratings, Waveguides, and Beyond
… the development of a multi-axis femtosecond laser micromachining platform. System capabilities were demonstrated by inscribing Fiber Bragg Gratings and waveguides using a 1040 nm laser, extended to 750 nm and 1260 nm with an Optical Parametric Amplifier. Precise control over FBG pitch and …
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Two Innovative Applications Combining Fiber Optics and High Power Pulsed Laser: Active Ultrasonic Based Structural Health Monitoring and Guided Laser Micromachining
… optics techniques involving high power pulse laser delivery. The first research topic is "Embedded Active Fiber Optic Sensing Network for Structural Health Monitoring in Harsh Environments", which uses the fiber delivered pulse laser for acoustic generation. The second research topic is "Fiber …
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Digital Manufacturing Techniques for Microfluidic Device Fabrication
… fabrication costs and time. Techniques such as laser micromachining and 3D printing, specifically stereolithography (SL), are explored in this research. Laser micromachining was used to engrave microchannels onto plastic poly(methyl methacrylate) substrates and the channel dimensions were …
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Highly Efficient Thermal Ablation of Silicon and Ablation in Other Materials
Laser micromachining has become increasing prominent in various industries given its speed, lack of tool wear, and ability to create features on the order of micrometres. Inherent stochastic variations from thermal ablation along with detrimental heat effects, however, limit the feasibility of …
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Miniaturized Magnetostrictive Antennas for Wireless Sensing Applications
… advantages and disadvantages have been studied. Laser micromachining is shown to be a more versatile method compared to fabrication using Diesaw to fabricate antennas of different shapes easily. The frequency response of the fabricated antennas is first studied in air and characterized using …
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Polaritonics : an intermediate regime between electronics and photonics
… vibrations are driven by optical femtosecond laser pulses directed into ferroelectric LiNbO3 or LiTaO3. The vibrational amplitude is proportional to the intensity of the excitation pulses. Due to the high dielectric constants of these crystals, phonon-polaritons travel in a predominantly …
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Sessile Droplet Microfluidic Platforms for Improvements in Mass Spectrometry Sample Preparation
… traps (SETs) into the surface using picosecond laser micromachining. Resulting SETs serve as anchor points to hold liquid droplets and can be filled spontaneously by discontinuous dewetting (DDW). By modifying the SET shape, evaporation dynamics of droplets can be controlled so that solute …
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Multiplexed Electrospray Emitters for Highly Conductive and Corrosive Fluids
… fluids. Then we customized a 1064nm fiber laser micromachining system to precisely and rapidly machine silicone sheet and silicon wafers. Laser energy and path are judicially chosen to create clean and round micro posts that form the external structure of the nozzles. For MES with low flow …
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Ablation of Steel by Microsecond Pulse Trains
Laser micromachining is an important material processing technique used in industry and medicine to produce parts with high precision. Control of the material removal process is imperative to obtain the desired part with minimal thermal damage to the surrounding material. Longer pulsed lasers, with …
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Bangolaidžių integravimas į lydytą kvarcą panaudojant femtosekundinius šviesos impulsus /
Nowadays ultrafast laser micromachining of transparent dielectrics, such as fused silica, is becoming one of the most promising and intriguing areas of photonics. One of the key factors owing to this, is the unique property of this type of radiation to induce refractive index changes, when focused …
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Progress Toward Durable Icephobic Materials
… detachment. A collaborative study of femtosecond laser micromachining done with McGill University is also included which showed the cross-link density dependence of threshold fluence, and the varied surface morphologies that could be accessed by these means. These studies show effective methods of …
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Portable Microfluidic Platform Employing Young-Laplace Pumping For Multiplexed Lab-On-A-Chip Applications
… The SETs are fabricated by a facile picosecond laser micromachining ablation method out of commercial NeverWetTM coated glass slides. The 3D printed platform allows for simultaneous initiation of Young-Laplace induced pumping on a chip. Furthermore, the flowrate of Young-Laplace induced pumping …
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Multifunctional Polymer Fiber Probes for Biomedical Application
… 3D printing (additive manufacturing), laser machining, thermal drawing, and electrospinning. The choice of fabrication methods heavily depends on the materials, geometry, and functionalities of biomedical devices. Currently, the thermal drawing process has proven to be an excellent …
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Defect tolerance assessment of silicon nitride in rolling contact.
… limitations in relation to these defects. Laser micromachining is used to produce precise holes and trenches to simulate missing material. Two different types of bearing grade silicon nitride are tested to determine tolerance and failure modes in rolling contact fatigue. Scanning electron …
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Lūžio rodiklio modifikavimas stikluose ir kristaluose veikiant ultratrumpaisiais lazerio impulsais /
… of transparent materials with ultrashort laser pulses is presented in this dissertation. Based on experimental data it was demonstrated, that using ultrashort pulses, generated with Yb:KGW laser system, it is possible to produce modified refractive index zones in the fused silica glass, …