Journal Article

PUBDB-2021-00854

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measuring the frequency chirp of extreme-ultraviolet free-electron laser pulses by transient absorption spectroscopy

Ding, T. (Corresponding author)Extern* ; Rebholz, M.Extern* ; Aufleger, L.Extern* ; Hartmann, M.Extern* ; Stooß, V.Extern* ; Magunia, A.Extern* ; Birk, P.Extern* ; Borisova, G. D.Extern* ; Wachs, D.Extern* ; da Costa Castanheira, C.Extern* ; Rupprecht, P.Extern* ; Mi, Y.Extern* ; Attar, A. R.Extern* ; Gaumnitz, T.Extern* ; Loh, Z.-H.Extern* ; Roling, S.XFEL.EU* ; Butz, M.Extern* ; Zacharias, H.Extern* ; Duesterer, S.DESY* ; Treusch, R.DESY* ; Eislage, A.DESY* ; Cavaletto, S. M. ; Ott, C. (Corresponding author)Extern* ; Pfeifer, T. (Corresponding author)Extern*

2021
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-020-20846-1  doi:10.3204/PUBDB-2021-00854

Abstract: High-intensity ultrashort pulses at extreme ultraviolet (XUV) and x-ray photon energies, delivered by state-of-the-art free-electron lasers (FELs), are revolutionizing the field of ultrafast spectroscopy. For crossing the next frontiers of research, precise, reliable and practical photonic tools for the spectro-temporal characterization of the pulses are becoming steadily more important. Here, we experimentally demonstrate a technique for the direct measurement of the frequency chirp of extreme-ultraviolet free-electron laser pulses based on fundamental nonlinear optics. It is implemented in XUV-only pump-probe transient-absorption geometry and provides in-situ information on the time-energy structure of FEL pulses. Using a rate-equation model for the time-dependent absorbance changes of anionized neon target, we show how the frequency chirp can be directly extracted and quantified from measured data. Since the method does not rely on an additional external field, we expect a widespread implementation at FELs benefiting multiple science fields by in-situ on-target measurement and optimization of FEL-pulse properties.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)
3. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
4. HF-Technik Elektronen (MHFe)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASH Beamline BL2 (FLASH)

Appears in the scientific report 2021

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