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A: Fachverband Atomphysik

A 14: Poster Session - Atomic Physics II

A 14.4: Poster

Dienstag, 10. März 2020, 16:00–18:00, Empore Lichthof

Collisional effects in the extreme nonlinear response of dielectrics — •Benjamin Liewehr¹, Björn T. Kruse¹, Christian Peltz¹, Peter Jürgens², Anton Husakou², Tobias Witting², Marc J. J. Vrakking², Alexandre Mermillod-Blondin², and Thomas Fennel^1,2 — ¹Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23, D-18059 Rostock — ²Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Str. 2A, D-12489 Berlin

The understanding of nonlinear optical phenomena in dielectric solids has been recently complemented by the physics of Bloch oscillations and interband recombination in the high frequency domain (HHG) [1,2] while low order harmonics have been linked to the strong field excitation dynamics that drive Brunel- and injection currents [3,4]. To which extent the excitation dynamics can be reconstructed from time resolved low order harmonic emission remains an open question, in particular regarding electron impact ionization and elastic collisions. Here we investigate the nonlinear electronic response using a rate-equation-based ionization-radiation model and study the effect of collisions on low-order wave-mixing. Possible routes to separate contributions from laser-driven strong-field ionization and electron-impact ionization avalanching are discussed.

[1] H. Liu et al., Nature Phys. 13, 262 (2017)

[2] G. Vampa, et al., Nature 522, 462 (2015)

[3] F. Brunel, J. Opt. Soc. Am. B 4, 521 (1990)

[4] P. Jürgens et al., arXiv:1905.05126 (2019)