Attosecond time–energy structure of X-ray free-electron laser pulses
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BORIS DOI
Date of Publication
2018
Publication Type
Article
Division/Institute
Contributor
Hartmann, N. | |
Hartmann, G. | |
Heider, R. | |
Wagner, M. S. | |
Ilchen, M. | |
Buck, J. | |
Lindahl, A. O. | |
Benko, C. | |
Grünert, J. | |
Krzywinski, J. | |
Liu, J. | |
Lutman, A. A. | |
Marinelli, A. | |
Maxwell, T. | |
Miahnahri, A. A. | |
Moeller, S. P. | |
Planas, M. | |
Robinson, J. | |
Kazansky, A. K. | |
Kabachnik, N. M. | |
Viefhaus, J. | |
Kienberger, R. | |
Coffee, R. N. | |
Helml, W. |
Subject(s)
Series
Nature Photonics
ISSN or ISBN (if monograph)
1749-4885
Publisher
Nature Publishing Group
Language
English
Publisher DOI
Description
The time–energy information of ultrashort X-ray free-electron laser pulses generated by the Linac Coherent Light Source is measured with attosecond resolution via angular streaking of neon 1s photoelectrons. The X-ray pulses promote electrons from the neon core level into an ionization continuum, where they are dressed with the electric field of a circularly polarized infrared laser. This induces characteristic modulations of the resulting photoelectron energy and angular distribution. From these modulations we recover the single-shot attosecond intensity structure and chirp of arbitrary X-ray pulses based on self-amplified spontaneous emission, which have eluded direct measurement so far. We characterize individual attosecond pulses, including their instantaneous frequency, and identify double pulses with well-defined delays and spectral properties, thus paving the way for X-ray pump/X-ray probe attosecond free-electron laser science.