Seed level requirement for improving the temporal coherence of a Free-Electron Laser

Abstract : 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.
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Submitted on : Wednesday, March 2, 2011 - 5:41:56 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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Guillaume Lambert, T. Hara, M. Labat, Takao Tanikawa, Y. Tanaka, et al.. Seed level requirement for improving the temporal coherence of a Free-Electron Laser. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2009, 88 (5), pp.54002. ⟨10.1209/0295-5075/88/54002⟩. ⟨hal-00573027⟩

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