Longitudinal Coherence Preservation and Chirp Evolution in a High Gain Laser Seeded Free Electron Laser Amplifier

Murphy, J. B. ; Wu, Juhao ; Wang, X. J. ; Watanabe, T.

Stanford Linear Accelerator Center

关键词: Green Function;    Accelerators,Accphy, Optics, Synchrad, Xfel;    43 Particle Accelerators;    Start-Up;    Electron Beams;   

DOI  :  10.2172/883267
RP-ID  :  SLAC-PUB-11852
RP-ID  :  AC02-76SF00515
RP-ID  :  883267

美国|英语

来源: UNT Digital Library

【 摘 要 】

In this letter we examine the start-up of a high gain free electron laser in which a frequency-chirped coherent seed laser pulse interacts with a relativistic electron beam. A Green function formalism is used to evaluate the initial value problem. We have fully characterized the startup and evolution through the exponential growth regime. We obtain explicit expressions for the pulse duration, bandwidth and chirp of the amplified light and show that the FEL light remains fully longitudinally coherent.