Generation of a self-chirped few-cycle optical pulse in a FEL oscillator.
We study the generation of a self-chirped optical pulse in a free-electron laser (FEL) oscillator. In a high-gain FEL oscillator, the frequency chirp is induced in the slippage region as a result of superradiant FEL resonance, and this time-frequency correlation evolves continuously into a few-cycle regime, if the optical cavity length is perfectly synchronized to the electron bunch interval. Numerical simulations based on the slowly evolving wave approximation and experimental results are presented.
Hajima
Ryoichi
R
Advanced Photon Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1195 Japan. hajima@popsvr.jaeri.go.jp
Nagai
Ryoji
R