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Appl. Sci. 2017, 7(8), 814;

Modeling Non-Equilibrium Dynamics and Saturable Absorption Induced by Free Electron Laser Radiation

Physics Division, School of Science and Technology, University of Camerino, I-62032 Camerino (MC), Italy
Current address: Department Chemie, Ludwig-Maximilians-Universität München, 81377 München, Germany
Author to whom correspondence should be addressed.
Received: 31 May 2017 / Revised: 22 July 2017 / Accepted: 27 July 2017 / Published: 9 August 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
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Currently available X-ray and extreme ultraviolet free electron laser (FEL) sources provide intense ultrashort photon pulses. Those sources open new exciting perspectives for experimental studies of ultrafast non-equilibrium processes at the nanoscale in condensed matter. Theoretical approaches and computer simulations are being developed to understand the complicated dynamical processes associated with the interaction of FEL pulses with matter. In this work, we present the results of the application of a simplified three-channel model to the non-equilibrium dynamics of ultrathin aluminum films excited by FEL radiation at 33.3, 37 and 92 eV photon energy. The model includes semi-classical rate equations coupled with the equation of propagation of the photon wave packets. X-ray transmission measurements are found to be in agreement with present simulations, which are also able to shed light on temporal dynamics (in the fs range) in nano-sized Al films strongly interacting with the photon pulse. We also expanded our non-linear model, explicitly including the two-photon absorption cross-section and the effect of including electron heating for reproducing transmission measurements. View Full-Text
Keywords: X-ray free electron laser; saturation phenomena; nonlinear optics X-ray free electron laser; saturation phenomena; nonlinear optics

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Hatada, K.; Di Cicco, A. Modeling Non-Equilibrium Dynamics and Saturable Absorption Induced by Free Electron Laser Radiation. Appl. Sci. 2017, 7, 814.

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