TY  - JOUR
AU  - Keitel, Barbara
AU  - Chalupsky, Jaromir
AU  - Jelinek, Simon
AU  - Burian, Tomas
AU  - Dziarzhytski, Siarhei
AU  - Hajkova, Vera
AU  - Juha, Libor
AU  - Kuglerova, Zuzana
AU  - Kuhlmann, Marion
AU  - Mann, Klaus
AU  - Ruiz Lopez, Mabel
AU  - Schaefer, Bernd
AU  - Vozda, Vojtech
AU  - Wodzinski, Thomas
AU  - Yurkov, Mikhail
AU  - Ploenjes-Palm, Elke
TI  - Comparison of wavefront sensing and ablation imprinting for FEL focus diagnostics at FLASH2
JO  - Optics express
VL  - 32
IS  - 12
SN  - 1094-4087
CY  - Washington, DC
PB  - Optica
M1  - PUBDB-2024-01281
SP  - 21532
PY  - 2024
AB  - Extreme ultraviolet (EUV) photon beam characterisation techniques, Hartmann wavefront sensing and single shot ablation imprinting, were compared along the caustic of a tightly focused free-electron laser (FEL) beam at beamline FL24 of FLASH2, the Free-electron LASer in Hamburg at DESY. The transverse coherence of the EUV FEL was determined by a Young’s double pinhole experiment and used in a back-propagation algorithm which includes partial coherence to calculate the beam intensity profiles along the caustic from the wavefront measurements. A very good agreement of the profile structure and size is observed for different wavelengths between the back-propagated profiles, an indirect technique, and ablation imprints. As a result, the Hartmann wavefront sensor including its software MrBeam is a very useful, single shot pulse resolved and fast tool for non-invasive determination of focal spot size and shape and also for beam profiles along the caustic.
LB  - PUB:(DE-HGF)16
C6  - 38859505
UR  - <Go to ISI:>//WOS:001249174500005
DO  - DOI:10.1364/OE.527418
UR  - https://bib-pubdb1.desy.de/record/604953
ER  -