Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Interaction with strong or short laser pulses II
A 6.3: Vortrag
Dienstag, 15. März 2022, 11:15–11:30, A-H1
Torus-knot angular momentum in attosecond pulses from high-harmonic generation — •Björn Minneker1,2,3, Birger Böning2,3, Anne Weber1, and Stephan Fritzsche1,2,3 — 1Theoretisch Physikalisches Institut, Friedrich-Schiller-Universität, Jena, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 3Helmholtz Institut, Jena, Germany
We investigated the dynamical symmetry related to the conservation of torus-knot angular momentum (TKAM) in attosecond bursts from high harmonic generation. In particular, we discuss the characterization of the TKAM for bicircular Laguerre-Gaussian driving beams. Since the orbital angular momentum of the emitted harmonics is not a good quantum number anymore, a different kind of angular momentum is required to characterize them, namely the TKAM. We developed an intuitive model which relates the characteristic parameters τ and γ of the TKAM to the geometry of a torus knot. This is done for both the driving beam and the harmonic radiation. In addition, we found a geometric relation between τ and γ. We hope that our contribution can help to get intuitively access to this form of angular momentum. Furthermore, TKAM maid help to improve the spectroscopical classification of high harmonics driven by bicircular beams.