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  • Open Access

Widely tunable two-color x-ray free-electron laser pulses

Eduard Prat1,*, Philipp Dijkstal1,2, Eugenio Ferrari1,†, Romain Ganter1, Pavle Juranić1, Alexander Malyzhenkov1,‡, Sven Reiche1, Thomas Schietinger1, Guanglei Wang1 et al.

Andre Al Haddad1, Sven Augustin1, Christoph Bostedt1,3, Gregor Knopp1, Jonas Knurr1,3, Ana Sofia Morillo-Candas1, Zhibin Sun1, and Kirsten Schnorr1

  • 1Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 2Department of Physics, ETH Zürich, 8092 Zurich, Switzerland
  • 3École polytechnique fédéral de Lausanne, CH-1015 Lausanne, Switzerland

  • *eduard.prat@psi.ch
  • †Present address: Deutsches Elektronen-Synchrotron, D-22607 Hamburg, Germany.
  • ‡Present address: CERN, CH-1211 Geneva 23, Switzerland.
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Phys. Rev. Research 4, L022025 – Published 2 May, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L022025

Abstract

We demonstrate the generation of widely tunable two-color x-ray free-electron laser (FEL) pulses at SwissFEL. In a split-undulator configuration, each color is produced in a different undulator section, and a chicane between the two sections allows for a variable time separation between the two pulses of up to 500 fs. We show an unprecedented photon energy ratio between the two colors of about three (350 and 915 eV), with each individual pulse having a peak power of a few gigawatts and a duration down to the femtosecond level. Moreover, we demonstrate the reduction of the required undulator length via the optical klystron mechanism and the time-resolved diagnostics of the FEL pulses utilizing the same beam setup as for the pulse generation. The unique combination of widely tunable energy and time separation of the two-color pulse pair offers opportunities to study ultrafast x-ray-induced energy transfer and relaxation processes in physics, chemistry, and biology.

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Phys. Rev. Research 4, L022025– Published 2 May, 2022
  • Received 21 February 2022
  • Accepted 4 April 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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