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 14 of 14 for “"Laser machining"”.
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Laser machining of ceramics and metals : development of a laser lathe
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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EFFECTS OF LASER MACHINING ON STRUCTURE AND FATIGUE OF 316LVM BIOMEDICAL WIRES
… creating a new challenge for manufacturing and machining. Some applications often include fine details that are impossible to achieve with rotary tool machining. Laser machining is one tool harnessing an enormous potential for the manufacture of such finely detailed devices as well as providing …
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Laser-processed parchment paper for fabrication of chronic wound dressings with selective oxygenation
… paper as a substrate and the use of inexpensive laser machining. The use of paper simultaneously provides structural strength, flexibility, mammalian cell biocompatibility, as well as selective filtering functionality, i.e., it allows for oxygen to pass through while preventing aqueous solutions …
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Phonon-polaritons in bulk and patterned materials
… motion beyond its linear regime. Femtosecond laser machining has been used to fabricate microstructures in lithium niobate and lithium tantalate. Phonon-polaritons propagation has been extensively characterized in a number of functional elements, including waveguides, resonators, and various …
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Development of an ultrafast laser ultra-precision machining platform
… manufacturing techniques using ultrafast lasers are limited with regards to accuracy and repeatability. This body of work investigates how to develop an ultra-precision ultrafast laser manufacturing platform. From literature it was found that there are a significant number of avenues that …
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Integrated Disposable Microfluidic Tissue Chips
… of these devices are explored, including laser machining of frozen membranes, and infrared bonding in a vacuum chamber. The chips are optically clear, exhibit strong thermal bonds, and display significantly lower levels of hormone absorption than earlier polydimethylsiloxane (PDMS) based …
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Pulsed laser induced breakdown in solid state materials and air
Laser induced breakdown is important in applications ranging from laser machining to laser induced breakdown spectroscopy to laser induced damage. Laser induced breakdown in dielectric materials results from a combination of multiphoton absorption (MPA), tunneling and avalanche ionization. Aspects …
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Monitoring Material Modification using Inline Coherent Imaging
Laser machining is a commonly used method for materials processing. Focusing laser energy onto a sample can lead to material modifications and achieve feature sizes on the order of micrometres. However, designing a machining platform capable of producing high quality, repeatable, and accurate …
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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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Deep Learning and Optimised Nanoplasmonic Sensors for Label-free Biomedical Applications
… writing of the structure using femtosecond laser machining (top to bottom). 3. Deep learning for the direct classification and processing of the raw Raman signal: The fabricated plasmonic surfaces are then used as SERS substrates for EV characterization. Due to the lack of chromophore …
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Microfabrication and Electrochemical Characterization of a Novel SU-8 Probe with an Array of Individually Addressable Electrodes Suitable for Redox Cycling Experiments in Ultra-small Volumes
… using microfabrication processes and a laser-machining procedure is described in detail. The probe features an array of individually addressable electrodes, each 100 μm long, 4 μm wide and with a 100 μm gap in between, on a shank that is 6 mm long and 100 μm wide. The probe is insulated …
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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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Advanced Manufacturing and Dielectric Material Characterization Techniques for High-Temperature mm-Wave Antennas
… and antennas can also be created through 3-D laser machining using a planar printed circuit board (PCB) manufacturing tool. In this work, a pressure sensor based on evanescent-mode resonance is demonstrated using this technique. This is demonstrated by first developing a study of laser etching …
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Laser micro-processing of silicon using nanosecond pulse shaped fibre laser at 1 μm wavelength
… Diode Pumped Solid State (DPSS) Ultraviolet (UV) laser. Recent advances in laser source technology have produced fibre lasers with Master Oscillator Power Amplifier (MOPA) architectures that offer high repetition rates, high operational efficiencies, and pulse modulation controls exceeding those …