Comment on 'Experimental Characterization of Superradiance in a Single-Pass High-Gain Laser- Seeded Free-Electron Laser Amplifier'

摘要

The authors report [1] on recent experiments on a free-electron laser (FEL) amplifier injected with a short pulse high power laser seed. They claim to have experimentally characterized, for the first time, superradiance in a single-pass high-gain laser-seeded FEL. We would like to make the following comments.