Global ETD Search
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Showing 1 to 20 of 188 for “"laser pulses"”.
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Generation and amplification of short laser pulses.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Electrical Engineering, 1972
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Adaptive control of electronic excitation utilizing ultrafast laser pulses
… during and after the 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 …
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Applications of femtosecond laser pulses in refractive eye surgery /
… for treatment of refractive errors is the laser-assisted in situ keratomileusis. The main goal of this work is to explore the possibility to replace two different laser systems (UV nanosecond and nIR femtosecond), that are currently used for the refractive corneal surgery, with a single …
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Measuring the Frequency of Light using Femtosecond Laser Pulses
… by the periodic pulse trains of femtosecond lasers. The output spectrum of such a laser consists of modes equally spaced by the repetition frequency of the pulses and forms a convenient ruler in frequency space. Extending this principle to the intervals between harmonics of the same optical …
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Schemes of ion acceleration employing high energy, petawatt laser pulses
… acceleration employing high energy, picosecond laser pulses. In two separate campaigns on the petawatt arm of the Vulcan laser system, novel laser and target parameters were implemented to explore schemes of ion acceleration beyond the well established target normal sheath acceleration (TNSA) …
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Atoms in intense ultrashort laser pulses and the absolute phase
… atomarer Prozesse in intensiven ultrakurzen Laserpulsen. Der Schwerpunkt liegt hierbei bei den Zwillingseffekten der Erzeugung hoher Harmonischer (``high-order harmonic generation'', HHG) und der Ionisation über Zustände im Kontinuum (``above-threshold ionization'', ATI). Besonders letzterer …
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Nonlinear Light - Matter Interactions of Ultrafast High Intensity Laser Pulses
… arise from the interactions of intense ultrafast laser pulses with various states of matter. These interactions involve electronic and molecular states and yield new information on the underlying fundamental processes that govern the molecular world. Modern day lasers offer ultrashort pulses, high …
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Nanometer scale observation of magnetization textures induced by ultrashort laser pulses
… manipulation of magnetic order with ultrashort laser pulses has become a vivid field in modern magnetism research. Laser pulses have been found to not only demagnetize magnetic materials on a femtosecond timescale, but even reverse the magnetization in certain (anti-)ferromagnetically coupled …
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Photoionization of atoms with ultrashort XUV laser pulses at extreme intensities
… atoms exposed to high intense and ultrashort XUV-laser pulses of free-electron lasers. In particular, the influence of coherent dynamics of the electrons as well as the electron-electron interaction are in focus of this survey and the resulting signatures as Rabi oscillations and characteristic …
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The effect of gain saturation on actively mode-locked laser pulses
… within pulse duration for actively node-locked lasers and to discuss its effects on the generated pulses. The population inversion, obtained analytically using a perturbation scheme, has been found to vary considerably within pulse envelope. An assumingly Gaussian pulse has been followed along …
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Probing the dynamical response of organic molecules to intense laser pulses
… response of organic molecules to intense laser pulses using a mixed quantum-classical approach in which the electrons are described using time dependent density functional theory while the ions move classically. We begin by laying out the theory behind the work including an explanation 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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The mechanism of thin film Si nanomachining using femtosecond laser pulses
Femtosecond (fs) laser ablation has been the subject of intense recent research. The pulse time ('width') is shorter than the electronic relaxation time, resulting in a decoupling of the period of laser illumination and the melting of the substrate. Since the laser does not directly heat the …
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COMPLETE TEMPORAL MEASUREMENT OF LOW-INTENSITY AND HIGH-FREQUENCY ULTRASHORT LASER PULSES
… temporal measurement of low-intensity picosecond pulses in the near-infrared (NIR) and intense ultrashort pulses in the ultraviolet (UV) and extreme ultraviolet (EUV). The former are projected to find great use in the field of optical telecommunications, while the latter are the result of the …
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Coherent ionization dynamics induced by intense X-ray free-electron laser pulses
… and solids irradiated by ultrashort and intense pulses from an (X-ray) free-electron laser are investigated with the objective to find appropriate conditions where coherent dynamics manifests itself in physical observables. The ionization dynamics induced by an X-ray or extreme ultraviolet laser …
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Dynamics of Energy Carriers in Solids During Interaction with Ultrafast Laser Pulses
… a transient response of the material by a short laser pulse and detects the response by optical observables such as reflectance and transmittance. This technique allows observation of the optical response, which is closely related to the dynamics of energy carriers, in the time domain with a high …
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Photoelectron Spectroscopy of highly oriented pyrolytic graphite using intense ultrashort laser pulses
… Pyrolytic Graphite (HOPG) using ultrashort laser pulses. It concentrates on the observation and understanding of a new phenomenon whereby infrared laser pulses of just 1.5eV photon energy can be used to generate photoelectrons with kinetic energies of up to 80eV. Intensity dependence …
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