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

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 s...

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Bibliographic Details
Published in:Physical review letters 2011-06, Vol.106 (23), p.234801-234801, Article 234801
Main Authors: Bachelard, R, Mercère, P, Idir, M, Couprie, M-E, Labat, M, Chubar, O, Lambert, G, Zeitoun, Ph, Kimura, H, Ohashi, H, Higashiya, A, Yabashi, M, Nagasono, M, Hara, T, Ishikawa, T
Format: Article
Language:English
Subjects:
AMPLIFICATION
DIFFRACTION
EVALUATION
FREE ELECTRON LASERS
HARMONICS
Optics
OTHER INSTRUMENTATION
Physics
RADIATIONS
SATURATION
SENSORS
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.106.234801