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 64 for “"ultrafast laser"”.
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Adaptively shaped advanced ultrafast laser sources
… is to investigate adaptively shaped advanced ultrafast laser sources in the near-(NIR) and the mid-infrared (MIR) regimes. The setup involves shaping a NIR pulse using an adaptively controlled liquid crystal spatial light modulator (LC-SLM) in a pulse shaper. The shaped NIR pulse is then …
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Ultrafast laser driven spin generation in metallic ferromagnets
… in metallic ferromagnets (FM) driven by ultrafast laser light using a pump-probe technique. The pump light gives a driving force for spin generation by depositing energy or spin angular momentum on FM. The probe light measures spin responses by magneto-optical Kerr effect or temperature …
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Adaptive control of electronic excitation utilizing ultrafast laser pulses
… interaction of matter with pulses of femtosecond laser radiation. The experiments presented here were performed in the gas phase and involve one atomic and several model molecular systems. Absorption of femtosecond laser radiation by these systems induces an electronic excitation, and subsequently …
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Atoms, ions and molecules in intense ultrafast laser fields
The dynamics of atoms and hydrogen molecules in ultrafast intense laser pulses are studied experimentally using time of flight mass spectroscopy and fast ion beam techniques. The content of the study can be split naturally into two parts; the first dealing with the interaction of noble gas atoms …
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Development of an ultrafast laser ultra-precision machining platform
… Currently, manufacturing techniques using ultrafast lasers are limited with regards to accuracy and repeatability. This body of work investigates how to develop an ultra-precision ultrafast laser manufacturing platform. From literature it was found that there are a significant number of …
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Characterization and application of simultaneously spatio-temporally focused ultrafast laser pulses
Chirped pulse amplication of ultrafast laser pulses has become an essential technology in the elds of micromachining, tissue ablation, and microscopy. With specically tailored pulses of light we have been able to begin investigation into lab-on-a-chip technology, which has the potential of …
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Dynamics of Energy Carriers in Solids During Interaction with Ultrafast Laser Pulses
… in terms of the energy-carrier dynamics. ^ Ultrafast spectroscopy is a powerful tool to examine the dynamics of energy carriers, which excites a transient response of the material by a short laser pulse and detects the response by optical observables such as reflectance and transmittance. …
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Multiscale Insights into Molecular Interfaces: STM Imaging and Ultrafast Laser-Induced Dynamics
… characterization of molecular self-assembly and ultrafast dynamics at interfaces by integrating high-resolution scanning tunneling microscopy (STM) with advanced spectroscopic and ultrafast laser techniques. Focusing on cyclopentadienyltricarbonylmolybdenum dimer (CPTCMD) as a model metallocene, …
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The role of near time coherent contrast on ultrafast laser driven radiation sources
… results from two campaigns using the Gemini laser system at RAL and the JETI 40 laser in Jena. Simulations using EPOCH are also presented. The overall theme is the effect of near time, femtosecond - tens of picoseconds, contrast on different mechanisms produced by laser - plasma …
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Ultrafast Laser Micromachining for Correction of Thin Optics for Next Generation X-ray Space Telescopes
… this thesis is the development of implementing ultrafast laser micromachining technology to the correction of thin-shell lightweight high-resolution mirrors for future high performance X-ray space telescopes. The existing fabrication methods cannot achieve the required accuracy for individual …
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Low-cost, highly efficient, and tunable ultrafast laser technology based on directly diode-pumped Cr:Colquiriites
… highly-efficient, and tunable femtosecond laser technology based on diode-pumped Cr:Colquiriite gain media (Cr:LiCAF, Cr3+:LiSAF and Cr:LiSGaF). By using inexpensive single-mode diodes ($150) as the pump source, we have obtained continuous-wave (cw) output powers >250-mW with slope …
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Applying Novel Material Characterization Techniques using Ultrafast Laser Excitation and Neutron Diffraction in Radiation Detector Crystals
To address outstanding issues in the growth and performance of crystals for radiation detection, I develop and employ several material characterization techniques not previously implemented in the field. Two main, interconnected issues are addressed: the cracking of certain crystals during the …
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Ultrafast laser fabrication of a K-band integrated optic 2-telescope beam combiner for astronomical interferometry
… dissertation explores the vast potential of the ultrafast laser inscription (ULI) fabrication technique for astrophotonics applications. A fibre-connectorised K-band 2-telescope integrated optics (IO) beam combiner is designed and fabricated in commercial Infrasil® glass (IG) to update the …
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Crack Tip Micromaching by Femtosecond Laser for Fracture Testing of Metal Laminates
… presents an experimental study of the effects of ultrafast laser ablation on the mechanical properties of metal laminates followed by FEA simulation to elucidate future experimental potential. The metals investigated are copper, niobium, and copper/niobium accumulative roll bonded (ARB) laminates. …
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High-dimensional, multiplexed, single-shot ptychography for spatiotemporal ultrafast pulse-beam characterization
Ultrafast lasers are exciting tools that provide novel opportunities in science and industry. Ultrafast lasers are fundamentally four-dimensional, since at every point in three-dimensional space an ultrafast laser may have a different temporal profile. As such, ultrafast lasers can only be …
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BioLaser: Establishing a High-Resolution Laser Ablation Tomography Platform for UK Bioimaging Research
… to these requirements a novel proof-of-concept ultrafast laser ablation tomography system named “BioLaser” was proposed. A proof-of-concept BioLaser system has been built using an existing ultrafast laser platform as a base. Several interchangeable high-resolution microscopes are integrated, as …
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All-solid-state femtosecond medical lasers and nonlinear laser-tissue interactions
Diode pumped all-solid-state ultrafast lasers are promising for mini-invasive refractive surgery and keratoplasty. A funda mental systematical study concerning ultrafast laser tissue interactions is crucial before applying the state of the art laser technology to ophthalmic applications. Porcine …
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Strong-field physics with ultrafast optical resonators
… fields from modern high-intensity, femtosecond laser systems can produce electrical forces that rival the binding forces in atomic and solid-state systems. In this strong-field regime, conventional non-linear optics gives way to novel phenomena such as the production of attosecond bursts of …
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Ultrafast Temperature Jump Study of Energy Transfer in Dye-Doped Polymer Films
Ultrafast laser spectroscopy of condensed matter samples containing dyes functioning as molecular optical heaters and optical thermometers is developed. A known amount of heat is deposited in a molecular solid sample and the temperature is accurately measured. This technique, termed ultrafast …
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