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Gain dynamics in a soft-X-ray laser amplifier perturbed by a strong injected X-ray field

Abstract : Seeding soft-X-ray plasma amplifiers with high harmonics has been demonstrated to generate high-brightness soft-X-ray laser pulses with full spatial and temporal coherence. The interaction between the injected coherent field and the swept-gain medium has been modelled. However, no experiment has been conducted to probe the gain dynamics when perturbed by a strong external seed field. Here, we report the first X-ray pump–X-ray probe measurement of the nonlinear response of a plasma amplifier perturbed by a strong soft-X-ray ultra-short pulse. We injected a sequence of two time-delayed high-harmonic pulses (λ = 18.9 nm) into a collisionally excited nickel-like molybdenum plasma to measure with femtosecond resolution the gain depletion induced by the saturated amplification of the high-harmonic pump and its subsequent recovery. The measured fast gain recovery in 1.5–1.75 ps confirms the possibility to generate ultra-intense, fully phase-coherent soft-X-ray lasers by chirped pulse amplification in plasma amplifiers.
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Contributor : Philippe Zeitoun <>
Submitted on : Monday, September 14, 2015 - 6:34:31 PM
Last modification on : Friday, October 16, 2020 - 3:41:02 AM

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Y Wang, S. Wang, L Li, Eduardo Oliva, M Berrill, et al.. Gain dynamics in a soft-X-ray laser amplifier perturbed by a strong injected X-ray field. Nature Photonics, Nature Publishing Group, 2014, 8, pp.381-384. ⟨10.1038/nphoton.2014.79⟩. ⟨hal-01199046⟩



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