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6 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…
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…
Resonant enhancement of a single attosecond pulse in a gas medium by a time-delayed control field
Wei-Chun Chu, C. D. Lin
An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through a dense helium gas…