Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics - Archive ouverte HAL Access content directly
Journal Articles Physical Review A : Atomic, molecular, and optical physics Year : 2018

Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics

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U. Zastrau
H. Lee
  • Function : Author
G. Dovillaire
  • Function : Author
V. Recoules
C. Blancard
  • Function : Author
P. Renaudin
  • Function : Author

Abstract

We present measurements of photon absorption by free electrons as a solid is transformed to plasma. A femtosecond x-ray free-electron laser is used to heat a solid, which separates the electron and ion heating time scales. The changes in absorption are measured with an independent probe pulse created through high-order-harmonic generation. We find an increase in electron temperature to have a relatively small impact on absorption, contrary to several predictions, whereas ion heating increases absorption. We compare the data to current theoretical and numerical approaches and find that a smoother electronic structure yields a better fit to the data, suggestive of a temperature-dependent electronic structure in warm dense matter.

Dates and versions

cea-01741518 , version 1 (23-03-2018)

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Cite

Gareth O. Williams, S. Künzel, S. Daboussi, B. Iwan, A. Gonzalez, et al.. Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics. Physical Review A : Atomic, molecular, and optical physics, 2018, 97 (2), ⟨10.1103/PhysRevA.97.023414⟩. ⟨cea-01741518⟩
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