Free-electron lasers producing ultrashort pulses with high peak power promise to extend
ultrafast non-linear spectroscopic techniques into the extreme-ultraviolet–X-ray regime. Key …

Multi-electron dynamics in atoms and molecules very often occur on sub-to few-femtosecond
time scales. The available intensities of extreme-ultraviolet (XUV) attosecond pulses have …

We report the single-cycle optical control of a freely propagating electron beam with an
isolated cycle of midinfrared light. In particular, we produce and characterize a modulated …

It is a long-standing challenge for laser technologies to generate intense fully coherent
pulses in the x-ray regime. Here, we demonstrate an external seeding mechanism, termed …

In ultrafast spectroscopy, the temporal resolution of time-resolved experiments depends on
the duration of the pump and probe pulses, and on the control and characterization of their …

Attosecond science promises to reveal the most fundamental electronic dynamics occurring
in matter and it can develop further by meeting two linked technological goals related to high …

Over the last 20 years, XUV and X-ray free-electron lasers have enabled a wide variety of
time-resolved experiments that have dramatically advanced our understanding of ultrafast …

We report the demonstration of optical compression of an electron beam and the production
of controllable trains of femtosecond, soft x-ray pulses with the Linac Coherent Light Source …

Abstract Short wavelength Free-Electron Lasers (FELs) are among the newest light sources
available to scientists to probe a wide range of phenomena, with chemical, physical and …

The successful realization of high gain free-electron lasers has opened new possibilities to
X-ray scientists for investigating matter in different states. The availability of unprecedented …