A synchronized VUV light source based on high-order harmonic generation at FLASH

Ultrafast measurements in the extreme ultraviolet (XUV) spectral region targeting femtosecond timescales rely until today on two complementary XUV laser sources: free electron lasers (FELs) and high-harmonic generation (HHG) based sources. The combination of these two source types was until recently...

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Published in:Scientific reports 2020-04, Vol.10 (1), p.6867-6867, Article 6867
Main Authors: Appi, Elisa, Papadopoulou, Christina C., Mapa, Jose Louise, Wesavkar, Nishad, Jusko, Christoph, Mosel, Philip, Ališauskas, Skirmantas, Lang, Tino, Heyl, Christoph M., Manschwetus, Bastian, Brachmanski, Maciej, Braune, Markus, Lindenblatt, Hannes, Trost, Florian, Meister, Severin, Schoch, Patrizia, Treusch, Rolf, Moshammer, Robert, Hartl, Ingmar, Morgner, Uwe, Kovacev, Milutin
Format: Article
Language:English
Subjects:
639/624/400/3923
639/766/36/1121
Chemical reactions
Experiments
Humanities and Social Sciences
Ionization
Lasers
Light sources
multidisciplinary
Optics
Radiation
Science
Science (multidisciplinary)
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Summary:Ultrafast measurements in the extreme ultraviolet (XUV) spectral region targeting femtosecond timescales rely until today on two complementary XUV laser sources: free electron lasers (FELs) and high-harmonic generation (HHG) based sources. The combination of these two source types was until recently not realized. The complementary properties of both sources including broad bandwidth, high pulse energy, narrowband tunability and femtosecond timing, open new opportunities for two-color pump-probe studies. Here we show first results from the commissioning of a high-harmonic beamline that is fully synchronized with the free-electron laser FLASH, installed at beamline FL26 with permanent end-station including a reaction microscope (REMI). An optical parametric amplifier synchronized with the FEL burst mode drives the HHG process. First commissioning tests including electron momentum measurements using REMI, demonstrate long-term stability of the HHG source over more than 14 hours. This realization of the combination of these light sources will open new opportunities for time-resolved studies targeting different science cases including core-level ionization dynamics or the electron dynamics during the transformation of a molecule within a chemical reaction probed on femtosecond timescales in the ultraviolet to soft X-ray spectral region.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-63019-2