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

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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https://hal.archives-ouvertes.fr/hal-01859817
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Submitted on : Wednesday, August 22, 2018 - 4:12:50 PM
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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, Nature Publishing Group, 2013, 4 (1), ⟨10.1038/ncomms3476⟩. ⟨hal-01859817⟩

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