Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Interaction with VUV and X-ray light
A 14.2: Vortrag
Mittwoch, 16. März 2022, 11:00–11:15, A-H1
Influence of multiple transitions for Quantum Coherent Diffractive Imaging — •Björn Kruse1, Benjamin Liewehr1, Christian Peltz1, and Thomas Fennel1,2 — 1Institute for Physics, University of Rostock, Germany — 2Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany
Coherent diffractive imaging (CDI) of isolated helium nanodroplets has been successfully demonstrated with a lab-based HHG source [1] operating in the vicinity of the 1s - 2p transition of helium. Near such strong resonances, a non-linear theoretical description including quantum coherence is required. We developed a density matrix-based scattering model in order to include quantum effects in the local medium response and explored the signatures of transition from linear to non-linear CDI for the resonant scattering from Helium nanodroplets [2]. We found substantial departures from the linear response case for already experimentally reachable pulse parameters. An important next step in this approach is the implementation of additional levels next to the 1s - 2p transition. This way, we can describe multiple non-resonant transitions and study transient shifts of energy levels as well as light-induced coupling in pump-probe scenarios. Particularly, their influence on CDI experiments is currently unknown as these effects are usually measured in the gas phase in attosecond transient absorption experiments [3].
[1] D. Rupp et al., Nat. Commun. 8, 493 (2017)
[2] B. Kruse et al., J. Phys. Photonics 2, 024007 (2020)
[3] P. Birk et al., J. Phys. B: At. Mol. Opt. Phys. 53 124002 (2020)