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.
Results
Showing 1 to 20 of 45 for “"CO2 laser"”.
-
Linear and nonlinear optical pulsed response of CO2 laser amplifiers.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1970. Ph.D.
-
Experiment and modeling : ignition of aluminum particles with a CO2 laser
… K/s. The experimental setup uses a focused CO_2 laser as a heating source and a plate capacitor aerosolizer to feed the aluminum particles into the laser beam. The setup allows using different environment for particle aerosolization. The velocities of particles in the jet are in the range of 0.1 …
-
Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser
… sensors with point-by-point irradiation under a CO2 laser beam. The type of fiber sensor under examination is desirable to be highly sensitive to the variation of the thickness and refractive index of a thin film deposited on the LPGs, making it a promising candidate as a core sensor component in …
-
Optimisation of process parameters of high power CO2 Laser cutting for advanced materials
… of advanced material processing techniques. Laser beam cutting (LBC) is an advanced processing technique applied widely in industry to cut different materials with high production rates. In order to optimise the LBC process, it is essential to first model the process accurately. In fact, an …
-
Osteogenese nach Laserosteotomie mit einem CO2-Laser im Vergleich zur Osteotomie mit konventioneller Sägetechnik - eine tierexperimentelle Studie
Laser osteotomy has several potential advantages in comparison to classical bone incision by mechanical saws. In previous studies the bone healing was delayed due to the damage of the thermal effects compared to mechanical instruments like the bone saw. With 7 Beagles as an experimental model, a …
-
Análisis coste efectividad entre la cordectomía transoral con láser CO2, la cordectomía por laringofisura y la radioterapia en el tratamiento del carcinoma glótico en estadios iniciales
… radiation therapy and endoscopic surgery with CO2 laser. The cost-effectiveness study shows that the CO2 laser treatment option is more cost effectiveness and therefore dominant over the other options. This study also serves as a support to help in decision-making in the treatment of epidermoid …
-
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. …
-
The interaction of infra-red laser radiation with solid targets
The pulsed HF chemical laser was discovered in 1966 by Deutsch. Early lasers had very low power outputs; it is only more recently that high power pulsed HF/DF lasers have emerged. This thesis is concerned with the development of a 10J HF laser in 1976 and subsequent interaction experiments. The …
-
Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap
… ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its diagnostic tools will …
-
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 …
-
Co-Assembly Of Nanostructured Hybrid Materials For Energy Applications
… In a first example, a 308 nm pulsed XeCl excimer laser was used to induce transient melting of amorphous silicon in colloidal self-assembly-directed silica templates, which subsequently solidified into crystalline silicon nanostructures with hexagonal nonclose-packed symmetry. Subsequently, by …
-
Maximum likelihood estimation in dynamical systems
… <br>- an application to measured data from a CO2 laser, using a <br>five-dimensional ordinary differential equation; <br> <br>- an extension of the multiple shooting method to delay differential <br>equations with applications to the Mackey-Glass system and to measured <br>data from an …
-
A quasi-electrostatic trap for neutral atoms
… Die Falle wird durch den Fokus eines CO2-Laser Strahls mit 30 W Dauerstrich-Leistung und nahezu gauss'schem Strahlprofil gebildet. Bei einem Fokus mit einer Strahltaille von 0.1 mm betraegt die Fallentiefe 118 muK fuer Caesium und 48 muK fuer Lithium. Es werden bis zu 1 000 000 Caesium …
-
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 …
-
Ignition and combustion behaviors of nano-composite energetic materials
… (AI/M0O3) composite mixture was examined. Laser ignition experiments were performed to determine the ignition time and burn rates of newly developed nano-Al mixed with M0O3. The scope of this work can best be summarized in two stages: first, the ignition time and bum rates for three …
-
Paravalvular sealing pf percutaneous heart valves
… onto mandrels and several techniques (CO2 - laser, ultra-sonic, solvent and conductive heat bonding) used to attach the scaffolds to pre-coated TAVR stents. Attachment strength was modelled by finite element analysis (FEA) of stents in the crimped and expanded conditions and empirically …
-
Entwicklung und Anwendung von Fluoreszenztracer-Verfahren für die lasergestützte, abbildende Spraydiagnostik
… unterschiedlichen Durchmesserabhängigkeiten von laserinduzierter Fluoreszenz (LIF) und Mie-Streuung, kann im Gegensatz zu konventionellen Verfahren auch in Bereichen hoher Spraydichte eingesetzt werden. Die Fluoreszenz stammt dabei von Farbstoffen, deren Fluoreszenzintensität in Abhängigkeit von …
-
Histo-morphologische und biochemische Evaluierung der neuen indirekten Revaskularisationsmethode Transmyokardiale Laserrevaskularisation (TMLR)
… evaluiert. <br>Methoden. Zur TMLR kam ein CO2-Laser zum Einsatz. Die Evaluierung erfolgte anhand makroskopischer Infarktgrößenbestimmung (Evansblau- und TTC-Färbung), Histopathologie (LFB, HE, TUNEL), Gewebswasseranalyse und klinisch-chemischer Enzymdiagnostik (LDH, a-HBDH, CK, CKMB, …
-
Application of Carbon Dioxide Waveguide Lasers to Infrared Saturation Spectroscopy
The development of tunable lasers has made possible spectroscopy at a resolution previously unattainable. Although continuous-wave broadly tunable sources in the 10 pm region do not yet exist , waveguide carbon dioxide lase r s offer a useful tunability about a large number of emission lines in …
Page 1 of 3