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 53 for “"multi-photon"”.
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Multi-photon decay mode spectroscopy of positronium
… for the branching ratio of the four-photon decay of parapositronium (BR4γ) was measured using a multi-gamma-ray spectrometer. For the first time in such measurements, the spectrometer consisted of an array of eight identical LaBr3:Ce scintillator detectors, each of which combines good …
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Coherent multi-photon interference and compensation of polarization dispersion
… explore strategies for coherent manipulation of multi-photon packets. Correlated multi-photon states can arise in nonlinear optical devices. A nonlinear quantum interferometer which includes these states can have interesting and strikingly different behavior from a conventional interferometer. …
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Multi-Photon Spectroscopic Studies of Molecule/Metal Interfaces and Graphene
This dissertation presents multi-photon spectroscopic studies on molecule/metal interfaces and graphene. Two different aspects of these ultrathin molecular or atomic materials were investigated: (1) the electronic structure of molecule/metal interfaces and (2) nonlinear optical properties of …
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Group-IV Colour Centres in Diamond for Multi-Photon Entangled State Generation
… computing via the generation of highly entangled photonic states. In particular, multi-dimensional cluster states are a universal class of entangled state which would enable measurement-based quantum computing and robust, error-tolerant quantum communication, and as such are an especially relevant …
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Search for multi-photon events from pp interactions at 300 GeV/c
… in a VPI-BNL collaboration, we have searched for multi-photon events from pp interactions at 300 GeV/c. We measured the multiplicity, energy and angular distributions of approximately 340,000 events. Of the 80,000 events that have been analysed, the angular distributions are consistent with photon …
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Investigation of Multi-Photon Excitation in Argon with Applications in Hypersonic Flow Diagnostics
… using excited state argon atoms, prepared via multi-photon excitation. In this dissertation, we report results on the first phase of this hypersonic wake measurement project. In particular, we have redesigned and characterized the performance of a high energy, nanosecond pulsed Ti:Sapphire …
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A multi-photon microscope for three dimensional functional recording of fast neuronal activity
… listed limitations by combining the technique of multi-photon microscopy with a unique method for 3D laser beam steering. The result is an instrument capable of monitoring physiological signals at multiple locations in the volume of space occupied by a neuron, a task that is unachievable with any …
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Design and Analysis of Hardware-Based Scheduler and Multi-Photon Quantum Cryptography Protocol
… in recent years. In this dissertation, a multi-photon quantum cryptography method is analyzed to take into account the fiber loss and collective-rotation noise. Compared with single photon protocols, the multi-photon protocol has longer transmission distance with better noise tolerance. …
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Multi-photon microscopy enhanced: Exploring annular beams and gold nano-particles for improved imaging
Laser scanning multiphoton microscopy (MPM) has emerged as a powerful tool for non-invasive three-dimensional imaging of biological tissue. The localized focal region enables confocality without the use of a physical pinhole while providing less photobleaching and photodamage compared to confocal …
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3 GHz Yb-fiber laser based femtosecond sources and frequency comb
… arbitrary waveform generation, high-speed photonic analog-to-digital conversion, and high-resolution spectroscopy. Femtosecond optical sources in the wavelength range between 0.7 [mu]m and 1.55 [mu]m have found many applications such as optical coherence tomography, high speed optical …
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Laser-molecule Interactions And The Effects Of Permanent Dipoles
… effects of permanent dipole moments in two-laser multi-photon transitions. Several examples of multi-photon, two-colour, two-level resonance profiles, calculated in the RWA and by using exact Floquet techniques, are used to demonstrate how particular multi-photon transitions can be optimized, and …
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Vibrational Spectroscopy and Potential Energy Surface Analysis of the X˜ And B˜ States of Thiophosgene
… A1) levels up to 8,000 cm-1. A six-dimensional multi-reference PES has also been fit, to a series of CASSCF ab initio calculations modeling the B˜(1 A1) state. Wavefunctions for both the X˜ (1A1) and B˜ (1A1) states were calculated in harmonic oscillator bases using the same …
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Scattering of Few Photon Fields by Two Level Systems in a One Dimensional Geometry
… to waveguides. We study the scattering of multimode photons from such emitters coupled losslessly to the confined geometry of a one dimensional waveguide. We develop novel techniques for describing the scattered state of both single and multi-photon wavepackets and explore how such …
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Optimized resources for efficient optical quantum information processing and sensing
… interferometry, detector characterization, and multi-photon processing. For each application, we examine the underlying quantum resource states and quantum technology resources. Careful attention is paid to how these resources can be optimized to maximize the efficiency of the overarching …
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Photon Sources for Linear Optical Quantum Computing
Quantum photonic technologies have many exciting applications including secure commu- nication, quantum enhanced measurement and quantum computing. Linear optical quantum computing (LOQC) is a technology of particular interest - especially given that recent progress in on-chip waveguide technology …
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Korrelierte Elektron-Ion-Stöße in starken Laserfeldern
… is changed into drift energy. In this regime, multi-photon processes, known from the ionization of neutral atoms ( Above-Threshold Ionization), and successive, so called correlated collisions, are important. The subject of the thesis is a study of binary Coulomb collisions in strong laser …
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Microvessel structure formation in a 3D perfused co-culture of rat hepatocytes and liver endothelial cells
… structures as observed by in situ multi-photon microscopy. By mixing female endothelial cells with male hepatocytes, the female cell population increased from initially -7% on day 1 to -12% on day 13, as determined by quantitative PCR on genomic DNA. The maintenance and …
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UV Induced Processes in Biomolecules, Hydrated Clusters and Stark Deflected Beams
… The key analytical tool in this thesis is UV <i>multi-photon ionization time-of-flight mass spectrometry</i> (MPI-TOF). High-resolution measurements on the RNA base uracil and its fully-deuterated analogue provide new evidence supporting a ring-opening process in a neutral electronic excited …
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The Role of Cell Division Orientation during Zebrafish Early Development
The development of multicellular organisms is dependent on the tight coordination between tissue growth and morphogenesis. The stereotypical orientation of cell divisions has been proposed to be a fundamental mechanism by which proliferating and growing tissues take shape. However, the actual …
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