Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 22: Attosecond Science
A 22.2: Vortrag
Mittwoch, 8. März 2017, 15:00–15:15, N 2
Attosecond spectroscopy using XUV-initiated high harmonic generation — •Michael Krüger1, Doron Azoury1, Gal Orenstein1, Henrik R. Larsson2, Sebastian Bauch2, Barry D. Bruner1, and Nirit Dudovich1 — 1Weizmann Institute of Science, 76100 Rehovot, Israel — 2University of Kiel, D-20489 Kiel, Germany
In XUV-initiated high harmonic generation (XiHHG), tunneling ionization is replaced by photoionization with an attosecond XUV pulse [1,2]. The resulting electron wavepacket is driven by an IR laser field and recollides with the parent ion, leading to coherent frequency up-conversion of the incoming XUV light. The emitted radiation carries the spectroscopic fingerprint of the full light-matter interaction. Here we demonstrate XiHHG in helium by irradiating the gas with XUV light at photon energies mostly below the atomic ionization threshold. We observe a strong dependence of the intensity of the generated XiHHG light on the temporal delay of XUV and IR. With the help of a strong-field model we are able to reconstruct the full quantum dynamics of the process and determine the initial electron wavepacket in amplitude and phase. Our approach combines the accuracy of high harmonic spectroscopy with the flexibility of XUV-IR pump-probe techniques and can address a wide range of ultrafast phenomena, e.g. inner-shell dynamics of complex molecules.
[1] K. Schafer et al., PRL 92, 023003 (2004).
[2] G. Gademann et al., NJP 13, 033002 (2011).