Modeling saturable absorption for ultra short X-ray pulses

Keisuke Hatada*, Andrea Di Cicco

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Saturable absorption was recently observed in transmission measurements above the LII,III edge of pure Al thin films using ultra short X-ray pulses at a free-electron-laser (FEL) facility. The high fluence reachable by FEL pulses, the shortness of the pulse duration, and the typical lifetime of the excited state are all important factors enabling observation of the phenomenon. We devised a simplified theoretical approach describing the saturation phenomenon using a three-channel model containing ground, excited and relaxed states. This phenomenological model explicitly includes the interaction between the solid and photon field in a semi-classical way, and the resulting non-linear coupled equation is solved numerically. We successfully applied this model to recent experimental results obtained using FEL radiation.

Original languageEnglish
Pages (from-to)177-180
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume196
DOIs
StatePublished - 2014/10

Keywords

  • Warm dense matter
  • X-ray free electron laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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