First Observation of Self-Amplified Spontaneous Emission in a   Free-Electron Laser at 109 nm Wavelength
  We present the first observation of Self-Amplified Spontaneous Emission (SASE) in a free-electron laser (FEL) in the Vacuum Ultraviolet regime at 109 nm wavelength (11 eV). The observed free-electron laser gain (approx. 3000) and the radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width and intensity fluctuations all corroborate the existing models for SASE FELs. 
J. Andruszkow, et al. ( TESLA Collaboration )