F. Glotin et al., TUNABLE X-RAY GENERATION IN A FREE-ELECTRON LASER BY INTRACAVITY COMPTON BACKSCATTERING, Physical review letters, 77(15), 1996, pp. 3130-3132
A nearly monochromatic x-ray beam of 7 to 12 keV has been produced wit
h an infrared free-electron laser (FEL). This is achieved when the int
ense laser field generated and stored in the laser optical cavity is b
ackscattered by the FEL relativistic electron beam.