Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 26: Interaction with VUV and X-ray light II

A 26.3: Talk

Thursday, March 12, 2020, 15:00–15:15, f107

Tracking Attosecond Electronic Coherences Using Phase-Manipulated Extreme Ultraviolet Pulses — •Andreas Wituschek, Lukas Bruder, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany

Coherent control and nonlinear spectroscopy schemes are powerful tools that allow the study and control of the dynamics of quantum systems. Novel light sources in the extreme ultraviolet (XUV) region paved the way for the extension of these tools to the XUV, allowing experiments with an unprecedented temporal resolution and site selectivity. However, this promise has not yet been met due to the experimental challenges arising at these short wavelengths.

In this work we use an XUV pulse pair created at the FERMI free-electron laser to measure directly in the time domain the coherent evolution and dephasing of electronic XUV wave packets. Independent control over relative phase and delay of the pulse pair allowed us to introduce a phase-cycling scheme, readily used in the visible regime. This provided the necessary interferometric stability and sensitivity to track the ultrafast coherences (150 as). Our technique facilitates a wide range of nonlinear spectroscopy as well as coherent control schemes, and is universally applicable to the whole wavelength range accessible with seeded FELs. In addition, it can be combined with tabletop High Harmonic Generation sources. Additional information and a complete list of collaborateurs of this project can be found here: A. Wituschek et al., arXiv:1906.07112 (2019)