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A: Fachverband Atomphysik
A 6: Attosecond Physics I (joint session A/MO)
A 6.3: Vortrag
Dienstag, 11. März 2025, 11:45–12:00, GrHS Mathe
Extracting RABBITT-like phase information from time dependent transient absorption spectra — •Julian Jakob1, Cornelia Bauer1, Murat-Jakub Ilhan1, Divya Barthi2, Christian Ott2, Thomas Pfeifer2, Klaus Bartschat3, and Anne Harth1 — 1Center for Optical Technologies, Aalen University, Aalen, Germany — 2Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany — 3Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, USA
We investigate transient absorption spectroscopy by exploring how the spectral phase of the attosecond pulse train modulates the optical density signal. The process is driven by the interaction of extreme ultraviolet (XUV) and near-infrared (NIR) fields, with their relative time delay playing a crucial role in shaping the dynamics [1]. As demonstrated in Reconstruction of Attosecond Beating by Interference of Two-Photon Transitions (RABBITT) experiments, the XUV phase can be measured by examining the photoionization electron spectrum as a function of the time delay between the XUV and NIR fields [2]. Similarly, the spectral phase of the XUV field imprints itself in oscillations of the optical density, which occur at twice the NIR frequency (2ωNIR). Using a few-level model, we simulate the quantum dynamics and validate our findings by solving the time-dependent Schrödinger equation (TDSE) for atomic hydrogen. This approach reveals how the spectral phase modulates the optical density, thereby providing a direct link to the underlying attosecond electron dynamics. [1] Holler, Phys. Rev. Lett. 106, 123601 (2011), [2] Hentschel, Nature 414, 509-513 (2001)
Keywords: Transient Absorption; RABBITT; Phase examination