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Disentangling Long Trajectory Contributions in Two-Colour High Harmonic Generation

Date Di, 21.05.2019 - Di, 21.05.2019
Time 16:45h
Speaker Dr. Cornelia Hofmann, MPI Physics of Complex Systems, Dresden, Germany
Location ETHZ Hönggerberg, HIT F 42
Program Abstract:This work investigates High Harmonic Generation (HHG) in gas targets, induced by intense two-colour orthogonally polarized driving fields. Including a weak second harmonic orthogonally polarised to the strong driving IR acts as a displacement gate for returning electron trajectories [1], allowing for a temporally resolved study of the HHG process. We compared classical trajectory Monte Carlo (CTMC) simulations based on a semiclassical model of strong field tunnel ionisation of helium to experimental HHG spectra. The influence of the Coulomb potential coupling the motion along both displacement directions could be investigated by this method.Furthermore, combining the CTMC with an analytical estimate [2] for the accumulated phase mismatch while propagating through a gas target, the relative contribution of long trajectories was studied. Particularly for low harmonic orders, long trajectories seem to influence the observed XUV spectrum even when the experimental setup is chosen to suppress long trajectories and favour phase matching for short trajectories [3].

[1] Shafir, D. et al., Nature 485 (7398), 343 -346 (2012).
[2] Balcou, P. et al., Phys. Rev. A, 55, 3204–3210 (1997).
[3] Hofmann, C. et al., Appl. Sci. 8, 341 (2018).
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