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 …

X-ray free-electron lasers (XFELs) provide intense pulses that can generate stimulated X-ray
emission, a phenomenon that has been observed and studied in materials ranging from …

We present the generation of x-ray pulses with average pulse energies up to one millijoule
and rms pulse durations down to the femtosecond level. We have produced these intense …

We describe an emerging hard X-ray spectroscopy technique, stimulated X-ray emission
spectroscopy (S-XES). S-XES has the potential to characterize the electronic structure of 3d …

We present a method to actively outcouple radiation from an x-ray regenerative amplifier.
The method uses an undulator within a cavity formed by the diamond mirror and is driven by …

An approach to modeling the dynamics of x-ray amplified spontaneous emission and
superfluorescence, the phenomenon of collective x-ray emission initiated by intense pulses …

We demonstrate theoretically and experimentally how the diffraction and interferometric
resolution limit for single-mode coherent cw laser light can be overcome by multi-photon …

A recently introduced theoretical framework for modeling the dynamics of x-ray amplified
spontaneous emission is based on stochastic sampling of the density matrix of quantum …

There has been a rise of a new analysis method of nonlinear X-ray spectroscopy for
materials science. This book provides the basic principles for understanding the issue and …

In a recent paper we proposed to build an x-ray laser oscillator (XLO) in the 6-10 keV range
providing intense, stable, transform-limited, x-ray pulses based on population inversion …