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New publication: Ultrastable, high-repetition-rate attosecond beamline for time-resolved XUV–IR coincidence spectroscopy

New publication in Review of Scientific Instruments!

In this work, we demonstrate a novel high-repetition-rate attosecond beamline specifically designed for time-resolved XUV–IR coincidence spectroscopy. The main advantage of our setup is the excellent stability of the experimental conditions due to the implementation of an industrial-grade Yb-based driving source and a collinear, monolithic delay interferometer for pump–probe spectroscopy eliminating short-term instabilities and long-term drifts of the relative delay. These characteristics allow for the continuous acquisition of experimental data for several hours or even days, which are usually required while applying coincidence detection, without the necessity of any active delay stabilization system.

In order to demonstrate the capability of our system, we studied, in a proof-of-principle measurement, the photoionization of helium by applying the RABBIT (reconstruction of attosecond beating by the interference of two-photon transitions) technique. From the obtained RABBIT spectrogram (shown in panel a), we can extract the oscillations of the so-called sidebands (depicted in panel b) created by two-photon transitions. The phases of such sideband oscillations (shown in panel c) contain information on the attosecond XUV pulse train used for ionization and the ionized target. With our system, we achieve an excellent accuracy in the phase determination of about 40 mrad, corresponding to about 12 as.

Besides photoionization studies of atoms, our system will allow the investigation of photoionization processes of various molecules with increasing complexity in the laboratory, as well as in the molecular or recoil frame.


20230720 publication

Reprinted with permission from D. Ertel et al., Rev. Sci. Instrum. 94, 073001 (2023). Copyright 2023, AIP Publishing



“Ultrastable, high-repetition-rate attosecond beamline for time-resolved XUV–IR coincidence spectroscopy”

D. Ertel et al., Rev. Sci Instrum. 94, 073001 (2023)