Wavefront analysis of nonlinear self-amplified spontaneous-emission free-electron laser harmonics in the single-shot regime - ENSTA Paris - École nationale supérieure de techniques avancées Paris Access content directly
Journal Articles Physical Review Letters Year : 2011

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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Dates and versions

hal-00964906 , version 1 (23-04-2014)

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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, 2011, 106 (23), ⟨10.1103/physrevlett.106.234801⟩. ⟨hal-00964906⟩
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