Speaker
Description
We report on a direct time-domain measurement of the temporal properties of a seeded free-electron laser pulse in the extreme ultraviolet spectral range. Utilizing the oscillating electromagnetic field of terahertz radiation, a single-shot THz streak-camera was applied for measuring the duration as well as spectral chirp of the generated intense XUV pulses in a fully parasitic way. The experiment was conducted at the seeding experiment of FLASH, the free electron laser user facility at DESY in Hamburg, Germany. The reported diagnostic capability is a prerequisite to tailor amplitude, phase and frequency distributions of XUV FEL beams on demand. In particular, it opens up a new window of opportunities for advanced coherent spectroscopic studies making use of the high degree of temporal coherence expected from a seeded FEL pulse.
