Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 9: Poster Session - Atomic Physics I

A 9.22: Poster

Monday, March 9, 2020, 16:00–18:00, Empore Lichthof

ATAS of neon with tunable few-cycle SWIR pulses — •Patrick Rupprecht, Lennart Aufleger, Alexander Magunia, Thomas Ding, Marc Rebholz, Stefano Amberg, Nikola Mollov, Felix Henrich, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg

Attosecond transient absorption spectroscopy (ATAS) has developed into an essential method to study excited-state coupling dynamics in atomic and molecular systems. So far, most ATAS experiments have been carried out with femtosecond laser pulses of one specific central wavelength. In this poster contribution, we present first results of ATAS measurements on neon with few-cycle, approximately 15 fs FWHM, pulses centered around 1300 nm, 1400 nm and 1550 nm. These short-wave infrared (SWIR) pulses were used for high harmonic generation as well as for a time-delayed strong-field perturbation pulse altering the neon absorption lines using a passively stable split and delay line. The influence of the different central wavelengths on the neon resonances in the extreme ultraviolet (XUV) 40 eV to 60 eV photon-energy regime is shown by varying the intensity of the SWIR in time overlap as well as recording XUV–SWIR time-delay traces at different SWIR intensities. Implications for resonance lineshape changes as well as light-induced state observations are discussed.