Experimental Demonstration of Attoseconds-at-Harmonics at the SASE3 Undulator of the European XFEL

We report on observations of single spike spectra (3–13% of events) upon employing a previously proposed method for single spike generation via harmonic conversion. The method was tested at the soft X-ray SASE3 undulator of the European XFEL. The first part of the undulator allows one to amplify bun...

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Bibliographic Details
Published in:Photonics 2023-01, Vol.10 (2), p.131
Main Authors: Trebushinin, Andrei, Geloni, Gianluca, Serkez, Svitozar, Mercurio, Giuseppe, Gerasimova, Natalia, Maltezopoulos, Theophilos, Guetg, Marc, Schneidmiller, Evgeny
Format: Article
Language:English
Subjects:
Amplification
attoseconds
Energy
Experiments
FEL
Fourier transforms
Free electron lasers
harmonic
Higher harmonics
Lasers
Pulse duration
Radiation
Short pulses
Soft x rays
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Summary:We report on observations of single spike spectra (3–13% of events) upon employing a previously proposed method for single spike generation via harmonic conversion. The method was tested at the soft X-ray SASE3 undulator of the European XFEL. The first part of the undulator allows one to amplify bunching at the fundamental as well as the higher harmonics. The downstream undulator is tuned to a harmonic, the fourth in our case, to amplify pulses with a shorter duration. We estimate the generated pulse duration within such a subset of short pulses at a level of 650 as. Considering the demonstrated probability of single spike events, this method is attractive for high repetition-rate free electron lasers.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10020131