Ultrafast population transfer and ionization mechanisms in intense laser fields
(2024)- Abstract
- This thesis addresses different aspects of atoms interacting with strong laser fields. The focus is on population and ionization dynamics occurring on ultrafast timescales, when atoms are subjected to intense extreme ultraviolet or infrared laser light. Different ways of modeling these interactions are considered. Comparisons to experimental results are performed in certain cases, and in other cases predictions are made for future experiments.
This thesis comprises five papers.
In paper I, we investigate resonant photoionization of helium atoms through an experiment performed using a free-electron laser, and through numerical simulations and a model based on Rabi oscillations.
In paper II, we consider another... (More) - This thesis addresses different aspects of atoms interacting with strong laser fields. The focus is on population and ionization dynamics occurring on ultrafast timescales, when atoms are subjected to intense extreme ultraviolet or infrared laser light. Different ways of modeling these interactions are considered. Comparisons to experimental results are performed in certain cases, and in other cases predictions are made for future experiments.
This thesis comprises five papers.
In paper I, we investigate resonant photoionization of helium atoms through an experiment performed using a free-electron laser, and through numerical simulations and a model based on Rabi oscillations.
In paper II, we consider another photoionization experiment performed using a free-electron laser, where the photon energy is resonant with a transition in the ion. The entanglement between the ion and photoelectron is studied with a model and with numerical simulations.
In paper III, resonant ionization is studied using the effective Hamiltonian formalism, and a prediction is made about stabilization of dressed states.
In paper IV, the RABBIT technique applied to an atom undergoing Rabi oscillations is studied theoretically, through numerical simulations and perturbative calculations.
In paper V, a model for frustrated tunneling ionization, based on the strong-field approximation is studied in detail, and compared with results from numerically solving the time-dependent Schrödinger equation. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/f7b4576a-4d08-4867-bdf9-aded54cdf42c
- author
- Olofsson, Edvin LU
- supervisor
- opponent
-
- Prof. Thumm, Uwe, Kansas State University, USA.
- organization
- publishing date
- 2024
- type
- Thesis
- publication status
- published
- subject
- keywords
- resonant photoionization, Rabi oscillations, free-electron laser, stabilization, ultrafast dynamics, strong-field approximation, frustrated tunneling ionization
- pages
- 225 pages
- publisher
- Department of Physics, Lund University
- defense location
- Lecture Hall Rydbergsalen, Department of Physics, Professorsgatan 1, Faculty of Engineering LTH, Lund University, Lund.
- defense date
- 2024-06-12 09:15:00
- ISBN
- 978-91-8104-058-6
- 978-91-8104-059-3
- language
- English
- LU publication?
- yes
- id
- f7b4576a-4d08-4867-bdf9-aded54cdf42c
- date added to LUP
- 2024-05-14 15:55:11
- date last changed
- 2024-05-16 15:17:18
@phdthesis{f7b4576a-4d08-4867-bdf9-aded54cdf42c,
abstract = {{This thesis addresses different aspects of atoms interacting with strong laser fields. The focus is on population and ionization dynamics occurring on ultrafast timescales, when atoms are subjected to intense extreme ultraviolet or infrared laser light. Different ways of modeling these interactions are considered. Comparisons to experimental results are performed in certain cases, and in other cases predictions are made for future experiments.<br/> <br/>This thesis comprises five papers.<br/> <br/>In paper I, we investigate resonant photoionization of helium atoms through an experiment performed using a free-electron laser, and through numerical simulations and a model based on Rabi oscillations.<br/> <br/>In paper II, we consider another photoionization experiment performed using a free-electron laser, where the photon energy is resonant with a transition in the ion. The entanglement between the ion and photoelectron is studied with a model and with numerical simulations.<br/> <br/>In paper III, resonant ionization is studied using the effective Hamiltonian formalism, and a prediction is made about stabilization of dressed states.<br/> <br/>In paper IV, the RABBIT technique applied to an atom undergoing Rabi oscillations is studied theoretically, through numerical simulations and perturbative calculations.<br/> <br/>In paper V, a model for frustrated tunneling ionization, based on the strong-field approximation is studied in detail, and compared with results from numerically solving the time-dependent Schrödinger equation.}},
author = {{Olofsson, Edvin}},
isbn = {{978-91-8104-058-6}},
keywords = {{resonant photoionization; Rabi oscillations; free-electron laser; stabilization; ultrafast dynamics; strong-field approximation; frustrated tunneling ionization}},
language = {{eng}},
publisher = {{Department of Physics, Lund University}},
school = {{Lund University}},
title = {{Ultrafast population transfer and ionization mechanisms in intense laser fields}},
url = {{https://lup.lub.lu.se/search/files/183469920/e_spik_Edvin_Olofsson.pdf}},
year = {{2024}},
}