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 24 for “"Pulsed laser ablation"”.
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DIAGNOSTICS AND REAL-TIME MONITORING OF PULSED LASER ABLATION
… diagnostics 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 …
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Fundamental mechanisms of pulsed laser ablation of biological tissue
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Pulsed laser ablation deposition and optical characterization of hexagonal-wurtzite silicon
… a simple deposition system demonstrated that laser ablation of the standard cubic-diamond silicon produces droplets containing hexagonal-wurtzite crystallites. In order to study the process parameters and to deposit larger hexagonal crystals, a new pulsed laser ablation system with variable …
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The role of chromophore on pulsed laser ablation of biological tissue
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Nanostructured diamond-like carbon by dual pulsed laser ablation-pulsed gas feeding
… carbon was deposited at room temperature by Pulsed Laser Ablation in a methane atmosphere on corning glass and silicon substrate. The structures of Diamond-like carbon film such the surface morphology and the composition has been studied by the scanning electron microscopy (SEM) and X-ray …
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Pulsed laser ablation of calcified biological tissue : physical mechanisms and clinical applications
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1991
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Pulsed laser ablation of tissue : analysis of the removal process and tissue healing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1988.
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Investigation of electrochemical and material properties of TiO2 nanostructures generated by pulsed laser ablation
… supercapacitor structure. In this method, we use pulsed laser ablation with the theory of increasing the surface area of electrodes. Although this method can be applied in different materials, we use titanium as a low-cost and lightweight material in our experiments. We use electrochemical and …
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Pulsed laser ablation and micromachining of 4H and 6H SiC wafers for high-temperature MEMS sensors
… provides a scientific investigation of the ablation behavior of single crystal 4H-SiC and 6H-SiC to improve the manufacturability and high-temperature performance of SiC based MEMS pressure sensors using laser applications. The ablation characteristics of both the polytypes were studied …
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Investigation of selective optical properties of Si/SiO2 nanostructures generated by pulsed laser ablation as-deposited and post-treated
… thin films are studied. A picosecond pulse laser was employed for indirect deposition of ablated silicon on glass substrates. Prominent parameters such as laser power, repetition rate, pulse duration, and scanning speed were changed to vary the structural and compositional properties of …
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Field emission of ZnO nano-structures produced by laser ablation
… designed to investigate the properties of laser produced plasmas, with in-situ time of flight mass spectrometry, for deposition of ZnO materials for applications as field electron emission sources. The results from the work are concerned with the study of the important physical processes …
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Plonasluoksnių saulės elementų apdirbimas ultratrumpais lazerių impulsais /
… theoretical analysis of thin layer ultrashort pulsed laser ablation processes for photovoltaic devices. Experimental work was supported by modeling and simulation of energy coupling and dissipation inside the layers. The absorbed laser energy was transformed to localized transient heating …
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Optical properties and structural characterization of ceramic crystals, pellets, and laser-ablation-deposited thin films
… kind of films studied. The method of deposition, pulsed laser ablation, was common to both SrBi₂Ta₂O₉ and TiO₂ films. The methods of investigations were also the same. There is an important race for the development of a practical ferroelectric memory. Among ferroelectrics that have attracted …
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Electrical properties of silicon surfaces and interfaces
… silicon nanoparticles are fabricated using a pulsed laser ablation supersonic expansion technique. The electrical and electroluminescence characteristics of devices containing these films are shown to be controlled by carrier transport through the nanoparticulate silicon layer. A conduction …
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Metal-TiO2 nanocomposites towards efficient solar-driven photocatalysis
… been followed: TiO2 nanoparticles obtained via pulsed laser ablation in liquid and optical engineering of multilayered metal-TiO2 thin films. The first approach maximizes the exposed surface, thus enhancing the photocatalytic efficiency. However, in this case nanomaterials is dispersed in the …
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Materials for High Temperature Thin Film Thermocouple Applications
… while the oxide thin films were deposited using pulsed laser ablation. Sapphire (1102) was used as substrate for all the thin film depositions. All the thin films were characterized for high temperature stability in terms of phase, microstructure and chemical composition using x-ray diffraction, …
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Growth and Characterization of Epitaxial Oxide Thin Films
… on different single crystal substrates by pulsed laser ablation. Highly epitaxial c-axis oriented and smooth SBT films were deposited on SrTiO3 (100) substrates. AFM studies revealed the growth of these films by 3-D Stranski-Krastanov mode. However, these films did not exhibit any …
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Characterisation of molecular materials for electronic devices
… oligomers deposited by thermal evaporation and pulsed laser ablation has been carried out through measurements of the optical absorption, dark conductivity and photoconductivity of samples with coplanar and sandwich geometries. The dark conductivity was measured as a function of field and …
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Nanodiamonds for biological applications: Synthesis by laser ablation and sensing of local magnetic environment by optical spectroscopy of NV centers
… I report a novel synthesis route for NDs by pulsed laser ablation (PLA) in water. PLA can directly produce diamonds on a nanoscopic scale, with potential advantages over alternative methods, like grinding of bulk crystals or detonation techniques. Specifically, I demonstrate synthesis of …
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