Spectral-phase interferometry for direct electric-field reconstruction applied to seeded extreme-ultraviolet free-electron lasers

B. Mahieu 1 D. Gauthier 2 G. De Ninno 2 H. Dacasa 1 M. Lozano 1 J.-P. Rousseau 1 P. Zeitoun 1 D. Garzella 3, 4 H. Merdji 5, 4
1 LOA - Laboratoire d'optique appliquée
2 Elettra Sincrotrone Trieste
3 SLIC - Serveurs Laser
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
4 LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
5 ATTO - Attophysique
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : We present a setup for complete characterization of femtosecond pulses generated by seeded free-electron lasers (FELs) in the extreme-ultraviolet spectral region. Two delayed and spectrally shifted replicas are produced and used for spectral phase interferometry for direct electric field reconstruction (SPIDER). We show that it can be achieved by a simple arrangement of the seed laser. Temporal shape and phase obtained in FEL simulations are well retrieved by SPIDER reconstructions, allowing to foresee the implementation of this diagnostics tool on existing and future sources. This will be a significant step towards an experimental investigation and control of FEL spectral phase.
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CEA | UNIV-PARIS-SACLAY | CEA-UPSAY | IRAMIS-LIDYL | ENSTA_LOA | DSM-IRAMIS | X-DEP-PHYS | X-LOA | CNRS | ENSTA | X | CEA-DRF

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B. Mahieu, D. Gauthier, G. De Ninno, H. Dacasa, M. Lozano, et al.. Spectral-phase interferometry for direct electric-field reconstruction applied to seeded extreme-ultraviolet free-electron lasers. Optics Express, Optical Society of America, 2015, 23 (14), pp.17665-17674. ⟨10.1364/OE.23.017665⟩. ⟨cea-01245772⟩

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