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7 papers · 2 filters
Absorption and emission of single attosecond light pulses in an autoionizing gaseous medium dressed by a time-delayed control field
Wei-Chun Chu, C. D. Lin
An extreme ultraviolet (EUV) single attosecond pulse passing through a laser-dressed dense gas is studied theoretically. The weak EUV pulse pumps the helium gas from the ground sta…
Nanoplasmonic near-field synthesis
Johannes Feist, M. T. Homer Reid, Matthias F. Kling
The temporal response of resonances in nanoplasmonic structures typically converts an incoming few-cycle field into a much longer near-field at the spot where non-linear physical p…
Ejection of quasi-free electron pairs from the helium atom ground state by single photon absorption
M. S. Schöffler, C. Stuck, M. Waitz +14
We investigate single photon double ionization (PDI) of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to ele…
Theory of ultrafast autoionization dynamics of Fano resonances
W. -C. Chu, C. D. Lin
We study atomic autoionization processes in the time domain. With the emerging attosecond extreme vacuum ultraviolet and soft x-ray pulses, we first address how to characterize the…
Laser-assisted-autoionization dynamics of helium resonances with single attosecond pulses
Wei-Chun Chu, Song-Feng Zhao, C. D. Lin
The strong coupling between two autoionizing states in helium is studied theoretically with the pump-probe scheme. An isolated 100-as XUV pulse is used to excite helium near the 2s…
Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states
Wei-Chun Chu, C. D. Lin
We study theoretically the photoabsorption spectra of an attosecond XUV pulse by a laserdressed atomic system. A weak XUV excites an autoionizing state which is strongly coupled to…