@inproceedings{oai:repo.qst.go.jp:00085881,
 author = {羽島, 良一 and Ryoichi, Hajima},
 book = {Proceedings of the 18th Annual Meeting of Particle Accelerator Society of Japan},
 month = {Oct},
 note = {In a free-electron laser oscillator, when the electron bunch length, slippage length, gain, optical cavity loss and detuning
length satisfy certain conditions, ultra-short pulses containing only a few cycles of the optical electric field are generated.
Such lasing is explained by superradiance FEL. Superradiance was first theoretically derived by Robert Dicke in the
context of the transition of atoms or molecules in a two-level system, and later experimentally confirmed. The
superradiance in FEL was theoretically studied by Rodolf Bonifacio et al. and many experiments have been conducted.
In the present study, we review the principle of superradiance in a two-level system and a FEL and discuss the similarities
and differences between them.},
 title = {共振器型自由電子レーザーにおける超放射},
 year = {2021}
}