The temporal coherence of Free-Electron Laser (FEL) sources, which exhibit, in the self-amplified spontaneous-emission mode, spiking spectral and temporal distributions, can be drastically improved by seeding with an external laser or high-order harmonics. Here, experiments at 160 nm put in evidence that the improvement of spectral properties (and thus temporal coherence) of the FEL radiation takes place for a larger seed intensity than the one required to overcome the shot noise. © Europhysics Letters Association.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Lambert, G., Hara, T., Labat, M., Tanikawa, T., Tanaka, Y., Yabashi, M., ... Couprie, M. E. (2009). Seed level requirement for improving the temporal coherence of a Free-Electron Laser. Europhysics Letters, 88(5), -. . https://doi.org/10.1209/0295-5075/88/54002