Volume 88, Number 5, December 2009
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||15 December 2009|
Seed level requirement for improving the temporal coherence of a Free-Electron Laser
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: firstname.lastname@example.org
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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