Wavefront analysis of nonlinear self-amplified spontaneous-emission free-electron laser harmonics in the single-shot regime

Abstract : The single-shot spatial characteristics of the vacuum ultraviolet self-amplified spontaneous emission of a free electron laser (FEL) is measured at different stages of amplification up to saturation with a Hartmann wavefront sensor. We show that the fundamental radiation at 61.5 nm tends towards a single-mode behavior as getting closer to saturation. The measurements are found in good agreement with simulations and theory. A near diffraction limited wavefront was measured. The analysis of Fresnel diffraction through the Hartmann wavefront sensor hole array also provides some further insight for the evaluation of the FEL transverse coherence, of high importance for various applications. © 2011 American Physical Society.
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Article dans une revue
Physical Review Letters, American Physical Society, 2011, 106 (23), 〈10.1103/physrevlett.106.234801〉
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Contributeur : Aurélien Arnoux <>
Soumis le : mercredi 23 avril 2014 - 15:18:32
Dernière modification le : jeudi 10 mai 2018 - 01:58:13

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R. Bachelard, P. Mercère, M. Idir, M.-E. Couprie, M. Labat, et al.. Wavefront analysis of nonlinear self-amplified spontaneous-emission free-electron laser harmonics in the single-shot regime. Physical Review Letters, American Physical Society, 2011, 106 (23), 〈10.1103/physrevlett.106.234801〉. 〈hal-00964906〉

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