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Journal Articles Nature Communications Year : 2013

Two-colour pump–probe experiments with a twin-pulse-seed extreme ultraviolet free-electron laser

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E. Allaria
  • Function : Author
R. Borghes
  • Function : Author
F. Capotondi
  • Function : Author
D. Castronovo
  • Function : Author
P. Charalambous
  • Function : Author
P. Cinquegrana
  • Function : Author
M. B Danailov
  • Function : Author
A. Demidovich
  • Function : Author
S. Di Mitri
  • Function : Author
B. Diviacco
  • Function : Author
D. Fausti
  • Function : Author
M. Fawley
  • Function : Author
E. Ferrari
  • Function : Author
L. Froehlich
  • Function : Author
A. Gessini
  • Function : Author
R. Ivanov
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M. Kiskinova
  • Function : Author
G. Kurdi
  • Function : Author
I. Nikolov
  • Function : Author
E. Pedersoli
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G. Penco
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L. Raimondi
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C. Serpico
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P. Sigalotti
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S. Spampinati
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C. Svetina
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Abstract

Exploring the dynamics of matter driven to extreme non-equilibrium states by an intense ultrashort X-ray pulse is becoming reality, thanks to the advent of free-electron laser technology that allows development of different schemes for probing the response at variable time delay with a second pulse. Here we report the generation of two-colour extreme ultraviolet pulses of controlled wavelengths, intensity and timing by seeding of high-gain harmonic generation free-electron laser with multiple independent laser pulses. The potential of this new scheme is demonstrated by the time evolution of a titanium-grating diffraction pattern, tuning the two coherent pulses to the titanium M-resonance and varying their intensities. This reveals that an intense pulse induces abrupt pattern changes on a time scale shorter than hydrodynamic expansion and ablation. This result exemplifies the essential capabilities of the jitter-free multiple-colour free-electron laser pulse sequences to study evolving states of matter with element sensitivity.
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Dates and versions

hal-01859817 , version 1 (22-08-2018)

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Cite

E. Allaria, F. Bencivenga, R. Borghes, F. Capotondi, D. Castronovo, et al.. Two-colour pump–probe experiments with a twin-pulse-seed extreme ultraviolet free-electron laser. Nature Communications, 2013, 4 (1), ⟨10.1038/ncomms3476⟩. ⟨hal-01859817⟩
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