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Showing 1 to 20 of 33 for “"Laser Heating"”.
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Studies of the high temperature properties of graphite and liquid carbon using pulsed laser heating
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1987.
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Laser Heating of Solid Hydrogen for Production of Vibrationally Excited Molecules for Use in Negative Hydrogen Ion Sources
An experiment has been performed in which laser light was used to heat hydrogen pellets on a metallic substrate. The purpose of heating the hydrogen is to create a vibrationally excited population of hydrogen for use in negative hydrogen ion sources. The desired heating temperature is 3000-6000 K.
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Portable laser-heating system for experiments with diamond anvil cells and its application to studies of geophysically important materials
… Arbeit beschrieben. I. Entwurf des mobilen Laserheizsystems für Experimente mit Diamantstempelzellen Die Technik der Laserheizung für Diamantstempelzellen ist augenblicklich die einzige Möglichkeit, Temperaturen von tausenden von Grad unter statischen Drücken im vielfachen Megabar-Bereich zu …
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New high pressure phase transition of natural orthoenstatite and sound velocity measurements at simultaneous high pressures and temperatures by laser heating
… high pressure phase. Secondly, I built the first laser-heating Brillouin spectroscopy system with the capability of performing single-crystal sound velocity measurements with laser heating to produce simultaneous high pressures and temperatures on samples in a diamond anvil cell. This experimental …
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Going Deeper into Laser Damage: Experiments and Methods for Characterizing Materials in High Power Laser Systems
Laser damage is a primary limiting factor to the design of high-power laser systems. This is true for short-pulse systems as well as long-pulse and continuous-wave (CW) systems. Unlike short-pulse laser damage, CW laser damage has been much less studied. This work comprises a background of laser …
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Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions
Laser interactions with metals involve absorption of photon energy by electrons, energy coupling between electrons and the lattice, and energy transport by diffusion of electrons and lattice vibrations. During picosecond laser irradiation of metal films, electrons and the lattice are not in thermal …
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Investigating temperature distributions and thermal conduction effects in laser-heated plasmas relevant to Magnetized Liner Inertial Fusion
Laser heating the fuel prior to implosion is a crucial step in Magnetized Liner Inertial Fusion (MagLIF). Experiments investigating this stage have been performed at Sandia National Laboratories. In these experiments, deuterium fuel within a cylindrical pipe, or liner, was heated using 527 nm laser …
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Experimental technique for studying high-temperature phase equilibria in reactive molten metal based systems
… apparatus suitable for acoustic levitation, laser heating, and splat quenching of small samples was developed and equipped with computer-based controller and optical diagnostics. Normal-gravity tests were conducted to determine the most suitable operating parameters of the levitator by direct …
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Thermo-optic Phase Spectroscopy techniques for multiscale thermal conductance characterization in semiconductor integrated circuits
… semiconductor films. Each technique combines AC laser heating, temperature sensing via probe beam deflection, and analytical modeling to extract thermal properties with high spatial resolution, sensitivity, and speed. A unified modeling framework accommodates multilayer structures with …
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Feasibility Study of Multi-application, Multi-Walled Carbon Nanotube for Magnetic Resonance Temperatrue Imaging Guided Laser Induced Thermal Therapy
… contrast agents and Near-Infared Radiation (NIR) laser absorbers are combined with Proton Resonance Frequency (PRF) based Magnetic Resonance Temperature Imaging (MRTI) to improve the safety and efficacy of Laser Induced Thermal Therapy (LITT). Instilled MWCNTs enable precise tumor localization and …
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Investigation of the properties of iron-bearing alloys and silicates and their implications for the Earth’s lower mantle and core
… resistive heaters, providing homogeneous heating up to 1000 K, which enables us to estimate the effect of temperature as well. Our Mössbauer and XANES data, collected at pressures to 110 GPa and temperatures to 1000 K for silicate perovskite, revealed a gradual transition involving Fe2+, …
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An attampt to measure the electron temperature of a Xenon Chloride excimer laser discharge plasma by Thomson scattering
… time a Xenon Chloride transverse discharge laser to the short, high power Nd:YAG pulse to within 5 ns. Attempts were made to determine the electron velocity distribution of the discharge plasma of this Xenon Chloride laser using the method of Thomson scattering. The Thomson scattering …
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Design of thermal control systems for testing of electronics
… need to be addressed. The first issue is the heating or cooling of devices to the desired temperature prior to being tested, and the second issue concerns temperature control during the actual functional test. This thesis covers the design, modeling and testing of two prototype systems. One …
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Intracellular Transport in Cancer Treatments: Carbon Nanohorns Conjugated to Quantum Dots and Chemotherapeutic Agents
… can then be translated to carbon nanohorn-based laser heating to generate thermal energy in a local region for delivery of high concentrations of chemotherapeutic agents. Although these two concepts are small pieces of the overall scope of nanoparticle-based therapies, they are fundamental to the …
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Laser Cooling of Antihydrogen
… of working with trapped antimatter made laser cooling the most promising choice. I demonstrate the ability to modify the kinetic energy distribution of a trapped sample of antihydrogen using the 1S-2Pf transition in antihydrogen using a vacuum ultraviolet (VUV) laser system (i.e. laser …
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Raman Spectroscopy and Synchrotron X-ray Diffraction Study of Lunar and Terrestrial Plagioclase Feldspar at High-Pressure and High-Temperature Conditions
… static experiments were also conducted using laser heating diamond anvil cell and synchrotron X-ray diffraction. Results reveal pressure/temperature-induced amorphization and crystallization kinetics of high-pressure phase changes. The phase diagram of intermediate plagioclase was constructed …
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Synthesis, Structure and Transport Properties of New Lanthanum-based Ternary Hydrides
… anvil cells, synchrotron X-ray diffraction, laser heating, and electrical transport measurements. In La–Y–H systems, partial Y incorporation lowered the formation pressure of LaH10-type clathrates while preserving the hydrogen cage network. Synchrotron X-ray diffraction imaging with …
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Performance of laser assisted micro-milling (laμmill) of titanium alloy using micro ball end mill
Laser assisted milling technique turns to be complicated and unpredictable when the machining size is scaled to micro level. Furthermore, less has been reported on the application of ball end mill in laser assisted micro milling. This study was carried out to evaluate and clarify the machining …
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Processing rate and energy consumption analysis for additive manufacturing processes : material extrusion and powder bed fusion
… achieves high throughput by introducing viscous heating at the cost of resolution. In powder bed fusion, due to the intensive laser heating, the process window is limited to ensure high density material while avoid excessive evaporation. Further study quantifies the inefficiency from heat …
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Time-Resolved THz Magnetospectroscopy: Techniques and Applications
… transition in this material induced by laser heating. Together, the methods developed represent significant steps towards enabling time-resolved studies of THz-frequency magnetic dynamics.
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