Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Attosecond Science III

A 20.5: Vortrag

Dienstag, 6. März 2018, 15:30–15:45, K 1.011

Simulation of Brunel harmonics from laser-driven dielectric solids — •Benjamin Liewehr¹, Björn Kruse¹, Christian Peltz¹, Peter Jürgens², Anton Husakou², Mikhail Ivanov², Marc Vrakking², Alexandre Mermillod-Blondin², and Thomas Fennel^1,2 — ¹Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23, D-18051 Rostock — ²Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Str. 2A, D-12489 Berlin

The onset of ultrafast structural modification of dielectric materials is accompanied by a wealth of non-linear phenomena, ranging from rapid ionization over local plasma formation, to high-harmonic generation (HHG)[1]. Brunel harmonics [2], being one of the possible nonlinear wave-mixing processes, are a promising optical probe for quantitative plasma diagnostics on the femtosecond time scale as they encode the ultrafast evolution of the plasma density due to sub-cycle ionization dynamics.

Using a simplified rate-equation-based ionization-radiation model we investigate optimal conditions for generating Brunel harmonics and study the qualitative signatures in the harmonic signal. The predictions from the continuum model are further compared with results from three-dimensional, microscopic particle-in-cell (MicPIC) simulations [3]. The emerging similarities and differences will be discussed.

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

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

[3] Ch. Peltz et al., New J. Phys. 14, 065011 (2012)