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 5802 for “"LASER"”.
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Laser photocatalysis.
… describes the first detailed investigation of laser light sources for the activation of semiconductor photocatalysts for use in wastewater treatment. Although semiconductor photocatalysis for water treatment has been extensively investigated over the past 20 years this is the first reported use …
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Laser guitar
… design is to replace the strings with beams of laser that run through a line of beam splitters at each fret, each of which sends a beam onto a photoresistor. By blocking the beam at different frets, the current through the resistors uniquely determines what fret is pressed. The motivation for …
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Development of vertical cavity transistor laser and microcavity laser
An energy-efficient semiconductor laser is of great interest for the massive data transmission demands in butt computing servers and supercomputing technologies. Currently, commercial vertical-cavity surface-emitting diode lasers (VCSELs) have achieved a data transmission rate of 25 Gbit/s per …
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Electric oxygen-iodine laser discharge scaling and laser performance
… first electric discharge pumped oxygen-iodine laser referred to as ElectricOIL. This exciting improvement over the standard oxygen-iodine laser utilizes a gas discharge to produce the necessary electronically-excited molecular oxygen, O2(a1), that serves as the energy reservoir in the laser …
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Laser, optical and electrical diagnostics of colliding laser-produced plasmas
… and explore potential applications of colliding laser produced plasmas. When two plasmas collide there are two extreme scenarios that can play out – the plumes can either interpenetrate or stagnate depending on the ion-ion mean free path. During interpenetration, the plasmas stream through each …
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Holographic laser resonators
… overlap within a population inverted region of a laser amplifier and the subsequent interference pattern between them spatially hole burns a grating into the gain. The diffraction efficiency of such gain-gratings is studied both theoretically and experimentally and it is shown that, due to the …
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Towards a free-electron laser driven by a laser wakefield accelerator
The free-electron laser (FEL) is a powerful source of tuneable coherent radiation that currently demands kilometre-scale beam lines for high-energy vacuum ultraviolet (VUV) and X-ray output. Driving an FEL with a laser wakefield accelerator (LWFA) electron beam would radically reduce the size of …
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A narrow linewidth diode laser system for strontium laser cooling applications
The diode laser system for laser cooling on the 1S 0 → 3P1 intercombination line of strontium discussed in this thesis allows us to cool and trap an atomic strontium sample to 15 muK. Samples in this temperature range are useful for the development of the next generation of atomic frequency …
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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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Pulsed laser deposition of chalcogenide glass materials for potential waveguide laser applications
… many applications for small scale, solid state lasers in the near infrared, where conversely there are very few such devices. A lasing device in a rare earth doped gallium-lanthanum-sulphide thin film is attractive due to emission at wavelengths in the 2 to 5 µm region where many gasses and …
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The Role of The Plasma During Laser-Gas and Laser-Metal Interactions
The regime of CW laser-plasma-target interaction at intensities below 10('7) W/cm('2) has been overlooked except for a few studies of gas assist configurations. The recent advances in industrial laser material processing and modeling efforts warrant a detailed study of laser-plasma-target …
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Microwave characterization of vertical cavity surface emitting diode laser and transistor laser
Semiconductor lasers are widely deployed in optical transceivers for optical fiber based short-reach (< 100m) data links. With increasingly growing data traffic worldwide in data centers, developments of faster optical transceivers, hence high-speed semiconductor lasers, are highly demanded. The …
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An experimental investigation of a talbe-top, laser-driven extreme ultraviolet laser
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Spectroscopy of Tm3+ : YLF as a laser material for diode laser pumping
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1988.
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Laser plasma particle velocities
Experiments were performed on laser produced plasma from aluminum target discs in a vacuum chamber at pressures a few times 10(-6) torr. Plasma analysis was achieved using a floating double electrostatic probe of tungsten wires biased at -15 volts DC. In analyzing 376 oscilloscope trace pictures of …
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Laser ablation ICP spectrometry.
This thesis reports investigations into laser ablation inductively coupled plasma emission spectrometry for rapid elemental analysis of a diverse range of samples: glasses, aqueous solutions, oils, coated steels and glasses, and biological samples.Bulk analysis of glasses for major, minor and trace …
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Femtosecond pulsed laser deposition
… two variations of the conventional pulsed laser deposition (PLD) technique. The first technique is femtosecond PLD, whereby the laser used to ablate the target has a significantly higher peak intensity and shorter pulse duration as compared to conventional nanosecond lasers more commonly …
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Organische Photonische-Kristall-Laser
Organische Photonische-Kristall-Laser werden hergestellt, indem eine dünne Schicht eines organischen Farbstoffs auf ein mikrostrukturiertes Plastiksubstrat aufgebracht wird. Die Lasertätigkeit in solchen Systemen beruht auf verteilter Rückkopplung, die vom Substrat verursacht wird. Die Substrate …
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