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.
Results
Showing 1 to 20 of 24 for “"Wavepackets"”.
-
Dynamics of Electronic Wavepackets in Atomic Rubidium
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-26T21:43:14Z No. of bitstreams: 1 oldenburg.pdf: 2719888 bytes, checksum: 312e1856e8742d2e5073aa8673f96b74 (MD5)
-
LAMINAR TURBULENT TRANSITION - SPECTRAL ANALYSIS AND COHERENT STRUCTURES OF DNS WAVEPACKETS
… concerns a direct numerical simulation (DNS) of wavepackets undergoing laminar turbulent transition in a Blasius boundary layer. A fully crossed factorial simulation design is used, in which 18 different wavepackets are analyzed to determine the combined effects of frequency, bandwidth and …
-
On three-dimensional internal wavepackets, beams, and mean flows in a stratified fluid
… types of internal wave disturbances: beam-like wavepackets, equally modulated wavepackets, and thin beams. Our models assess the combined effects of nonlinearity, three-dimensional modulations, viscosity, and background rotation to determine the roles that they play in wave evolution and …
-
Probing the Dissociation of the Rubidium Dimer by Wavepackets and Parametric Four-Wave Mixing
Embargo set by: Seth Robbins for item 82331 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
-
Frequency-resolved ultrafast dynamics of phonon polariton wavepackets in the ferroelectric crystals LiNbO₃ and LiTaO₃
… to the corresponding counter-propagating wavepackets of phonon polaritons. Thus, the dynamics of these wavepackets was separately studied. Based on these findings, I develop the mathematical description of the so-called homodyne detection of light for the case of light scattering from …
-
Study of Wavepacket Dynamics in Rubidium Vapor by Means of Time-Frequency Analysis
Wavepackets are excited in rubidium vapor by intense ultrashort (∼100 fs) pulses centered at a wavelength of 620 nm or 770 nm. The generated atomic wavepackets are optically detected via a pump-probe experiment based on axially phase-matched parametric four-wave mixing (FWM). This nonlinear …
-
Scattering of Few Photon Fields by Two Level Systems in a One Dimensional Geometry
… scattered state of both single and multi-photon wavepackets and explore how such wavepackets interact with arrays of emitters coupled to a one dimensional waveguide. Finally, we apply these techniques and analyze the capability of two particular systems to act as a quantum conditional logic gate. …
-
Ultrafast Dynamics and Nonlinear Interactions in Alkali Atoms and Diatomics
… D states of the Cesium dimer and to study atomic wavepackets and nonlinear effects in Rubidium and Potassium. Two color, pump-probe techniques have been used to probe the time evolution of wavepackets in the B, C, and D rovibrational levels of Cs$\sb2$. The temporal history of the wavepacket is …
-
Parametric subharmonic instability of internal gravity wave beams
… wave beam with short-scale subharmonic wavepackets in a nearly inviscid stratified Boussinesq uid. A novel system of coupled evolution equations that govern this nonlinear interaction is derived and analyzed. For beams with general localized prole, unlike monochromatic wavetrains, it is …
-
Exploring Atom-Light Scattering in the Quantum Regime
… and incoherent light scattering of single-atom wavepackets and the relation to which-way information. For two atoms tightly localized to a 20nm size on the same lattice site, I demonstrate the strong electric dipolar interactions between them, which result in large momentum transfers and …
-
Stability, LES, and Resolvent Analysis of Thermally Non-uniform Supersonic Jet Noise
… to understand how dispersion and propagation of wavepackets can be modified by noise reduction strategies based on secondary injections of fluid with a different temperature from the main jet. The research is organized into three studies that focus on instability, large eddy simulations, and …
-
Nonlinear optical processes and the nearest neighbor distribution in rubidium vapor
… on the production and evolution of atomic wavepackets in the nonlinear medium are investigated. A number of femtosecond-scale phenomena that were elusive or previously unknown are observed, including the observation of quantum beating at pump-probe time delays exceeding 500 ps, quantum …
-
Three-dimensional solitary waves in dispersive wave systems
… small-amplitude lumps resemble fully localized wavepackets with envelope and crests moving at the same speed, and the wave envelope along with the induced mean-flow component are governed by a coupled Davey-Stewartson equation system of elliptic-elliptic type. The lump profiles feature …
-
Stabilization of autoionizing states
… wavepacket. The evolution of these wavepackets was monitored by changing the timing between the exciting "pump" laser and the stimulating "probe" laser"--Abstract, page iv.</p>
-
Dynamics and stability of gravity-capillary solitary waves
… solitary waves in the form of small-amplitude wavepackets can be obtained for which the phase speed of the carrier oscillations matches the group speed of their envelope. Such an extremum is found in the analysis of water waves when the restoring forces of both gravity and surface tension are …
-
Atoms, ions and molecules in intense ultrafast laser fields
… their molecular ions. In the ions, vibrational wavepackets have been studied and the phenomena of dephasing and revival observed. Additionally signatures of rotational wavepacket dynamics have been isolated in the neutral molecules. A technique to verify the laser pulse duration at the focus has …
-
Development of a Wavelet -Based Algorithm and Fitness Function for Computational and Experimental Quantum Control of Intramolecular Vibration Redistribution
… slowing down the time evolution of vibrational wavepackets in polyatomic molecules---""freezing"" intramolecular vibration redistribution (IVR)---required knowledge of the eigenstate-resolved phase and amplitude structure of the wavepacket. Experiments, however, can not provide such informa tion …
-
Exciton Dynamics in DNA-Chromophore Assemblies
… of this platform for imaging. Using vibrational wavepackets, we detect a previously unknown dark state in a cyanine fluorophore and identify the associated structural mode coupling likely responsible for its formation. We then incorporate this fluorophore into a DNA double crossover tile for easy …
-
Timekeeping and accelerometry with robust light pulse atom interferometers
… to 30 photon recoil momenta between interfering wavepackets-the largest to date for Raman atom optics. This splitting, in principle, enables up to a factor-of-15 improvement in sensitivity over the nominal interferometer. By forgoing cooling methods that reduce atom number, this LMT method …
-
THz polaritonics : control, confinement, and strong light-matter interactions
… used to generate and detect THz phonon-polariton wavepackets with full spatiotemporal resolution while they are confined to a thin slab of lithium niobate (LN) or lithium tantalate (LT) that is roughly 30-100 pm thick. Polaritonics is an attractive platform for wave-based computing because of its …
Page 1 of 2