| Issue |
EPL
Volume 88, Number 5, December 2009
|
|
|---|---|---|
| Article Number | 54002 | |
| Number of page(s) | 5 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/88/54002 | |
| Published online | 15 December 2009 | |
Seed level requirement for improving the temporal coherence of a Free-Electron Laser
1
Laboratoire d'Optique Appliquée, ENSTA-CNRS-Polytechnique - Chemin de la Hunière, 91761 Palaiseau, France, EU
2
Synchrotron SOLEIL - Saint Aubin, BP 34, 91192 Gif-sur-Yvette, France, EU
3
IRAMIS/SPAM CEA-Saclay - 91191 Gif-sur-Yvette, France, EU
4
XFEL Project Head Office/RIKEN - 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
5
ENEA C.R. - Frascati, RM, Italy, EU
6
UVSOR facility, IMS - Okazaki 444-8585, Japan
Corresponding author: guillaume.lambert@ensta.fr
Received:
9
September
2009
Accepted:
17
November
2009
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.
PACS: 41.60.Cr – Free-electron lasers / 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation
© EPLA, 2009
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