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Time-resolved ionization measurements with intense ultrashort XUV and X-ray free-electron laser pulses

Journal Article · · Laser and Particle Beams
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [6];  [6];  [6];  [6];  [6];  [7];  [5];  [8];  [8];  [9];  [8];  [10]
  1. Hochschule Emden/Leer Univ. of Applied Sciences (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. Hochschule Emden/Leer Univ. of Applied Sciences (Germany)
  3. Hochschule Emden/Leer Univ. of Applied Sciences (Germany); Inst. of the Helmholtz-Zentrum Dresden-Rossendorf (Germany)
  4. Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  6. Elettra Sincrotrone Trieste (Italy)
  7. Univ. of Hamburg (Germany)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  9. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Polish Academy of Sciences (PAS), Krakow (Poland)
  10. Hochschule Emden/Leer Univ. of Applied Sciences (Germany); Carl von Ossietzky Univ. (Germany)
Abstract

Modern free-electron lasers (FEL) operating in XUV (extreme ultraviolet) or X-ray range allow an access to novel research areas. One instance is the ultrafast ionization of a solid by an intense femtosecond FEL pulse in XUV which consequently leads to a change of the complex index of refraction on an ultrashort timescale. The photoionization and subsequent impact ionization resulting in electronic and atomic dynamics are modeled with our hybrid code XTANT(X-ray thermal and non-thermal transitions) and a Monte Carlo code XCASCADE(X-ray-induced electron cascades). The simulations predict the temporal kinetics of FEL-induced electron cascades and thus yield temporally and spatially resolved information on the induced changes of the optical properties. In a series of experiments at FERMI and LCLS, single shot measurements with spatio-temporal encoding of the ionization process have been performed by a correlation of the FEL pump pulse with an optical femtosecond probe pulse. An excellent agreement between the experiment and the simulation has been found. Furthermore, we demonstrate that such kind of experiments forms the basis for pulse duration and arrival time jitter monitoring as currently under development for XUV-FELs.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
German Ministry of Education and Research; USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1547231
Journal Information:
Laser and Particle Beams, Journal Name: Laser and Particle Beams Journal Issue: 2 Vol. 37; ISSN 0263-0346
Publisher:
Cambridge University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (21)

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Picosecond relaxation of X-ray excited GaAs journal September 2017
Soft x-ray induced femtosecond solid-to-solid phase transition journal September 2017
The European X-ray free-electron laser facility in Hamburg journal December 2011
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First lasing and operation of an ångstrom-wavelength free-electron laser journal August 2010
First light from SACLA journal July 2011
Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet journal September 2012
Achieving few-femtosecond time-sorting at hard X-ray free-electron lasers journal February 2013
Hard X-ray free-electron laser with femtosecond-scale timing jitter journal October 2017
Multistep transition of diamond to warm dense matter state revealed by femtosecond X-ray diffraction journal March 2018
Hard X-ray induced fast secondary electron cascading processes in solids journal September 2018
Sub-10 fs gating of optical pulses journal July 2001
Single-shot timing measurement of extreme-ultraviolet free-electron laser pulses journal March 2008
Nonthermal phase transitions in semiconductors induced by a femtosecond extreme ultraviolet laser pulse journal January 2013
Tight-binding calculation of the optical absorption cross section of spherical and ellipsoidal silicon nanocrystals journal August 2005
Photon energy dependence of graphitization threshold for diamond irradiated with an intense XUV FEL pulse journal August 2013
Thermal and nonthermal melting of silicon under femtosecond x-ray irradiation journal February 2015
Transient optical properties of semiconductors under femtosecond x-ray irradiation journal April 2016
Pulse Duration of Seeded Free-Electron Lasers journal June 2017
Transient Changes of Optical Properties in Semiconductors in Response to Femtosecond Laser Pulses journal August 2016

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