Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Attosecond Science I (joint session A/MO)

A 2.1: Hauptvortrag

Montag, 5. März 2018, 10:30–11:00, K 1.011

Phase measurement and control with attosecond self-probing spectroscopy — •Michael Krüger — Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel

Attosecond spectroscopy is based steering electron dynamics by the electric field waveform of a strong laser field. High-harmonic generation (HHG), the mechanism underlying the production of attosecond pulses in the extreme ultraviolet (XUV), provides an in-built spectroscopic pump-probe measurement with extremely high spatial and temporal accuracy. The amplitude and phase of the emitted XUV radiation encodes all parts of the light-matter interaction in the recollision process, including ionization, propagation and photo-recombination. Here we present two applications of attosecond self-probing spectroscopy. In the first experiment, we initiate HHG with an XUV pulse instead of tunneling ionization, enabling us to measure and control the XUV photo-ionization dynamics in the presence of a strong infrared field in amplitude and phase [1]. In the second experiment, we compare HHG from two atomic species using linear XUV interferometry and extract the absolute difference in the photo-recombination dipole phase with high spatial resolution [2]. Our method gives access to hitherto inaccessible phase information, enabling attosecond control of HHG and tomographic reconstruction of the electronic structure of matter.

[1] D. Azoury et al., Nat. Comm. 8, 1453 (2017). [2] D. Azoury et al., manuscript in preparation (2017).