Svea Kapitzki

TL;DR: The Free-electron LASer (FLASH) is a unique source for extremely bright ultra-short laser-like pulses tunable in a wide spectral range in the extreme ultraviolet and soft x-ray region as discussed by the authors.

TL;DR: In this article, a self-supporting Hartmann wavefront sensor was developed for the extreme ultraviolet (EUV) and soft x-ray range, which operates in a wavelength range from 6 to 30 nm with the capability to measure the wavefront quality of individual free-electron laser (FEL) pulses for beam characterization and monitoring behind user experiments.

TL;DR: A high resolution online grating spectrometer has been set up at the free electron laser in Hamburg FLASH at DESY in Hamburg as discussed by the authors, which combines a plane mirror and two plane variable line spacing gratings and is installed at the non-monochromized beamline branch at FLASH.

TL;DR: In this article, a self-supporting Hartmann sensor operating in the wavelength range from 6 to 30nm was used to determine the wavefront quality of individual free-electron laser (FEL) pulses.

TL;DR: The Free-Electron-Laser FLASH at DESY has been characterized by a quantitative determination of the Wigner distribution function as mentioned in this paper, which enables the mapping of two-dimensional phase spaces corresponding to the horizontal and vertical coordinate axes, respectively.