Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 9: Poster Session - Atomic Physics I
A 9.20: Poster
Monday, March 9, 2020, 16:00–18:00, Empore Lichthof
Strong-field ionization driven by spatially structured laser fields — •Birger Böning1, Willi Paufler1, and Stephan Fritzsche1,2 — 1Helmholtz-Institut Jena, Germany — 2Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Germany
We theoretically investigate nondipole effects in the above-threshold ionization (ATI) of atoms using the strong-field approximation (SFA). To this end, we construct Volkov-like continuum wavefunctions of the photoelectron in laser fields with an arbitrary spatial dependence. We show how to find these solutions to the Schrödinger equation for an electron in a laser field that can be written as a continuous superposition of plane waves. This approach includes, for example, Gaussian or twisted laser fields and is therefore not limited to plane waves. As a first application, we compute peak offsets along the laser propagation direction in the ATI with mid-infrared plane-wave laser fields. As a second application, we consider the ATI driven by standing light waves, which gives rise to the so-called high-intensity Kapitza-Dirac effect.