Linear accelerator-based free-electron lasers (FELs) are the leading source of fully coherent
X-rays with ultra-high peak powers and ultra-short pulse lengths. Current X-ray FEL facilities …

Generation of intense, fully coherent radiation with wide spectral coverage has been a long-
standing challenge for laser technologies. Several techniques have been developed in …

We report the first generation of coherent, tunable, variable-polarization, soft X-ray
femtosecond pulses, generated by a seeded free-electron laser (FEL) operating in the fresh …

Accelerator-based light sources such as storage rings and free-electron lasers use
relativistic electron beams to produce intense radiation over a wide spectral range for …

The Shanghai soft X-ray Free-Electron Laser facility (SXFEL), which is the first X-ray FEL
facility in China, is being constructed in two phases: the test facility (SXFEL-TF) and the user …

The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) is under
construction and aims at generating X-rays between 0.4 and 25 keV with three FEL …

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 …

The Shanghai soft X-ray Free-Electron Laser facility (SXFEL) is being developed in two
steps; the SXFEL test facility (SXFEL-TF), and the SXFEL user facility (SXFEL-UF). The …

To improve temporal coherence in electron beam based light sources, various techniques
employ frequency up conversion of external seed sources via electron beam density …

Linear accelerators delivering high brightness electron beams are essential for a number of
current and proposed accelerator applications, such as free electron lasers (FELs). In this …