A method for generating femtosecond-duration x-ray pulses with a free-electron laser is presented. This method uses an energy-chirped electron beam propagating through an undulator to produce a frequency-chirped x-ray pulse by self-amplified spontaneous emission. A short temporal pulse is created by use of a monochromator to select a narrow radiation bandwidth. A second undulator is used to amplify the short-duration radiation. The radiation characteristics produced by a chirped-beam two-stage free-electron laser are calculated, and the performance of the chirped-beam two-stage option for the Linac Coherent Light Source is considered.
© 2002 Optical Society of America
(140.2600) Lasers and laser optics : Free-electron lasers (FELs)
(230.1480) Optical devices : Bragg reflectors
(320.1590) Ultrafast optics : Chirping
(320.2250) Ultrafast optics : Femtosecond phenomena
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
Carl B. Schroeder, Claudio Pellegrini, Sven Reiche, John Arthur, and Paul Emma, "Chirped-beam two-stage free-electron laser for high-power femtosecond x-ray pulse generation," J. Opt. Soc. Am. B 19, 1782-1789 (2002)