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 9 of 9 for “"Coherent excitation"”.
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Measurements of the time evolution of coherent excitation
In recent years, coherent excitation techniques have focused on the ability to efficiently prepare atomic or molecular systems into a selected state. Such population control plays a key role in cutting-edge research taking place today, such as in the areas of quantum information and …
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Coherent excitation of ultracold atoms between ground and Rydberg states
… the development of an experiment to study coherent population transfer between ground states, and between ground and Rydberg states, in ultracold atoms. In order to study coherent transfer between hyperfine ground states a pair of phase stable Raman beams is required. Both beams are derived …
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Quantum Interference Effects in Precision Spectroscopy of Helium Fine Structure
… quantum interference effects, which are due to coherent excitation of the atom to multiple neighbouring states, and may result in substantial shifts in the measured positions of resonance line centres, even if the transition frequencies of adjacent resonances are thousands of natural widths …
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Rydberg Time-Of-Flight And Imaging Probes Of The Velocity-Dependent Hydrogen Atom Spin Polarization
… distribution, complex dissociation pathways, and coherent excitation mechanisms may be revealed. Approaches to detect SPH atoms are experimentally challenging due to the difficulty associated with probing ground-state H atoms through isolated fine structure levels, which is the only direct way to …
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Electron impact excitation of 2p states in atomic hydrogen
… experimental investigation of coherence in the excitation of the 2p states of atomic hydrogen through a collision with an unpolarised electron. The polarisation correlation variation of the delayed coincidence method has been employed to simultaneously measure the reduced Stokes parameters P1,P2 …
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The taiji and infinity-loop microresonators: examples of non-hermitian photonic systems
… studied. This phenomenon induces simultaneous excitation of the clockwise and counterclockwise modes, leading to eigenvalue splitting. This splitting makes the use of typical quality factor estimation methods unfeasible. To overcome this problem and mitigate the negative effects of …
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Fluctuations and exciton dynamics in molecular semiconductors
… results pointed to an instantaneous, coherent excitation of an intermediate bitriplet state. Using the exciton momentum maps, the dynamics could be projected to the orbital character of the underlying states and which proves that bitriplet states are not instantaneously excited, but …
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Coherently-driven exciton polaritons and directional cQED effects in the quantum dot-micropillar system
… of a strongly coupled cQED system under coherent optical excitation which is one of the primary goals of this work. The work presented in this thesis aims at a deeper understanding of cQED effects in semiconductor based implementations of this central topic of quantum optics. It includes …
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Ultrafast dynamics in quantum materials probed by time-and-momentum-resolved techniques
… the second part of the thesis focuses on the coherent acoustic phonons in quantum materials observed with UED. The crystalline lattice is the building block of any solid-state system and, thus, the most important aspect in condensed matter physics research. The study of coherent acoustic …