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 84 for “"laser irradiation"”.
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Optimizing graphene oxide reduction via laser irradiation
… single step method to reduce graphene oxide via laser irradiation. A computer numerically controlled laser engraver equipped with a 450nm laser diode was engineered to conduct this research. Reduced graphene oxide samples were prepared on a polycarbonate substrate at various laser powers, scan …
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Subsurface modification in Si induced by nanosecond laser irradiation
… modifications can be induced by focussed pulsed laser irradiation when the photon energy is near or below the material's bandgap. Intensity dependent absorption is used to selectively modify the region near focus. This technique is useful both for technological applications and scientific …
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Subsurface modification in Si induced by nanosecond laser irradiation
… modifications can be induced by focussed pulsed laser irradiation when the photon energy is near or below the material's bandgap. Intensity dependent absorption is used to selectively modify the region near focus. This technique is useful both for technological applications and scientific …
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Photothermal effects of pulsed laser irradiation of biological tissue
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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VUV 157nm F₂ laser irradiation of micro- and nano-scale particles
… VUV, emission from a molecular fluorine gas, F₂, laser. The laser system is introduced and an overview of laser ablation of polymers is presented.Small particles of different materials and sizes, supported on polymeric substrates, are irradiated at a wavelength of 157nm. The silica particles are …
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The physical response of soft musculoskeletal tissues to short pulsed laser irradiation
… properties of knee meniscus using a low energy laser technique. Following irradiation by a 10 ns laser pulse, tissue undergoes thermoelastic expansion in response to laser-induced stresses. The stresses evolve, propagating through the tissue. If they exceed the material's strength, ablation …
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The thermodynamic response of polymers and biological tissues to pulsed laser irradiation
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Green synthesis, characterization and laser irradiation of silver nanoparticles and its bimetallic nanoparticles
… to fabricate nanostructure by using diode laser irradiation. The green synthesized silver nanoparticles (Gre-Ag NPs) used as reducing and stabilizing agent to synthesize silver/copper nanoparticles (Ag/Cu NPs). The Ag NPs was synthesized by mixing Silver nitrate solution (AgNO3) (1, 3 and 5 …
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Femtosecond-laser irradiation as a platform for tailoring the optoelectronic properties of silicon
… to light in the infrared. Femtosecond (fs) laser irradiation offers multiple unique approaches to improving the optoelectronic properties of silicon, enabling both thin-film silicon photovoltaics and silicon-based IR photodetectors. In this thesis I study the structure-property-processing …
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A Study of Infrared Femtosecond Laser Irradiation on Monolayer Graphene on SiO2/Si Substrate
… sensors. This thesis focuses on the femtosecond laser processing of graphene from both scientific and industrial points of view. Started from the manufacturing process, a new manufacturing route for graphene devices based on a femtosecond laser system is explored. In this thesis, the graphene …
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Experimental and theoretical studies of surface and volume changes in dielectrics induced by long-pulse RF CO₂ laser irradiation
This thesis describes research into infrared (IR) laser irradiation and damage of four commercially significant polymers: polyimide (PI), polyether ether ketone (PEEK), polyethylene terephthalate (PET) and polypropylene (PP). Many research groups have studied the laser ablation and irradiation of …
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Micro-structural modifications of semiconductor systems under irradiation: experiment, modeling and simulation analysis.
… central role in the last decades. In particular, Laser Thermal Annealing receives a great interest in the formation of ultra-shallow junctions essential in nanoscale metal-oxide-semiconductor technology. An intriguing poorly understood issue is the post-implant kinetics of the defects-dopant …
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Selected studies in fast atom bombardment mass spectrometry
… looked at enhancing FAB ion yields using laser irradiation. Although inadequate photon fluxes were available to photoionize the desorbed neutral species above the target, enhancements in signal intensity and fragment ion formation were observed when the laser irradiation was deposited …
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Untersuchung der bakteriziden Wirkung von Nd:YAG-Laserstrahlung am Leitkeim Enterococcus faecalis in bovinem Dentin bei Pulsdauern von 15 und 25 ms : eine In-vitro-Studie
… is to determine the bactericidal depth effect of laser irradiation with a wavelength of 1064 nm at pulse durations of 15 and 25 ms. Given that the success of endodontic treatment depends on the effective elimination of microorganisms from the root canal and this cannot always be achieved by …
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Kontaktwinkelmessung an bovinem Zahnschmelz vor und nach der Behandlung mit kariesprophylaktischen Materialien und Methoden
… olive oil, xylitol (40 percent for 24h), argon laser irradiation. The group with argon laser was divided into two, first with a laser irradiation at 12,5 J/cm² and second with an irradiation at 25 J/cm². There was statistical significance in 6 of the 7 measurements. Only the xylitol group had no …
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Synthesis, Fabrication and Surface Modification of Nanocrystalline Nickel Oxide for Electronic Gas Sensors
… using different techniques, such as pulsed laser deposition, RF sputtering, electrochemical deposition and sol-gel. The focus of this research was to synthesize and characterize the gas sensing behavior of nickel oxide metal oxide gas sensors. Thin films of nickel oxide synthesized by a …
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Effect of Laser Induced Crystallinity Modification on Degradation and Drug Release of Biodegradable Polymer
… of PLLA degradation and drug release over time. Laser irradiation is used in this study to induce surface melting and resolidification. The high cooling rate of the laser treatment coupled with the slow polymer crystallization kinetics leads to reduced surface crystallinity after the laser …
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Theoretical, Experimental, and Numerical Investigations Into Laser Repair of Adhered MEMS Structures
… the beam and substrate and cooling time after laser irradiation.
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Modal analysis of laser vibrated structures
This thesis describes the laser irradiation of metallic structures to excite mechanical vibrations within those structures. As found by other authors, single high-power laser pulses ablate the irradiated surface material and may impulsively excite structural vibration; however, the use of laser …
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