XUV double-pulses with femtosecond to 650 ps separation from a multilayer-mirror-based split-and-delay unit at FLASH Academic Article uri icon


  • Extreme ultraviolet (XUV) and X-ray free-electron lasers enable new scientific opportunities. Their ultra-intense coherent femtosecond pulses give unprecedented access to the structure of undepositable nanoscale objects and to transient states of highly excited matter. In order to probe the ultrafast complex light-induced dynamics on the relevant time scales, the multi-purpose end-station CAMP at the free-electron laser FLASH has been complemented by the novel multilayer-mirror-based split-and-delay unit DESC (DElay Stage for CAMP) for time-resolved experiments. XUV double-pulses with delays adjustable from zero femtoseconds up to 650 picoseconds are generated by reflecting under near-normal incidence, exceeding the time range accessible with existing XUV split-and-delay units. Procedures to establish temporal and spatial overlap of the two pulses in CAMP are presented, with emphasis on the optimization of the spatial overlap at long time-delays via time-dependent features, for example in ion spectra of atomic clusters.


  • Sauppe, M
  • Rompotis, D
  • Erk, B
  • Bari, S
  • Bischoff, T
  • Boll, R
  • Bomme, C
  • Bostedt, C
  • Dörner, S
  • Düsterer, S
  • Feigl, T
  • Flueckiger, Leonie J
  • Gorkhover, T
  • Kolatzki, K
  • Langbehn, B
  • Monserud, N
  • Müller, E
  • Müller, JP
  • Passow, C
  • Ramm, D
  • Rolles, D
  • Schubert, K
  • Schwob, L
  • Senfftleben, B
  • Treusch, R
  • Ulmer, A
  • Weigelt, H
  • Zimbalski, J
  • Zimmermann, J
  • Möller, T
  • Rupp, D

publication date

  • 2018