NDLI: Bound-State Electron Dynamics Driven by Near-Resonantly Detuned Intense and Ultrashort Pulsed XUV Fields

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Bound-State Electron Dynamics Driven by Near-Resonantly Detuned Intense and Ultrashort Pulsed XUV Fields

Content Provider	MDPI
Author	Magunia, Alexander Aufleger, Lennart Ding, Thomas Rupprecht, Patrick Rebholz, Marc Ott, Christian Pfeifer, Thomas
Copyright Year	2020
Description	We report on numerical results revealing line-shape asymmetry changes of electronic transitions in atoms near-resonantly driven by intense extreme-ultraviolet (XUV) electric fields by monitoring their transient absorption spectrum after transmission through a moderately dense atomic medium. Our numerical model utilizes ultrashort broadband XUV laser pulses varied in their intensity (1014–1015 W/cm2) and detuning nearly out of resonance for a quantitative evaluation of the absorption line-shape asymmetry. It will be shown how transient energy shifts of the bound electronic states can be linked to these asymmetry changes in the case of an ultrashort XUV driving pulse temporally shorter than the lifetime of the resonant excitation, and how the asymmetry can be controlled by the near-resonant detuning of the XUV pulse. In the case of a two-level system, the numerical model is compared to an analytical calculation, which helps to uncover the underlying mechanism for the detuning- and intensity-induced line-shape modification and links it to the generalized Rabi frequency. To further apply the numerical model to recent experimental results of the near-resonant dressing of the 2s2p doubly excited state in helium by an ultrashort XUV free-electron laser pulse we extend the two-level model with an ionization continuum, thereby enabling the description of transmission-type (Fraunhofer-like) transient absorption of a strongly laser-coupled autoionizing state.
Starting Page	6153
e-ISSN	20763417
DOI	10.3390/app10186153
Journal	Applied Sciences
Issue Number	18
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-09-04
Access Restriction	Open
Subject Keyword	Applied Sciences Quantum Science and Technology Atomic Physics Ultrashort Physics Bound-bound Electronic Transitions Strong-field Couplings Transient-absorption Spectroscopy Line Shape Manipulation Free-electron-laser Numerical Calculations
Content Type	Text
Resource Type	Article

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