Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.6: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Strong-field assisted VUV amplification in doped helium droplets — •Andreas Rubisch, Ulf Saalmann, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

High harmonic generation in intense laser pulses is a valuable tool to obtain radiation in the UV and x-ray regime. In order to overcome the typically low conversion efficiency, it was proposed to assist the emission of high harmonics in single atoms or molecules by an intense near-infrared (NIR) driving pulse [1].

Such a mechanism could be powerful in atomic clusters as well. There the NIR pulse generates a nano-plasma, which, however, is highly unstable upon evaporation. Here we study helium droplets doped with a handful of xenon atoms, where by means of dopant-induced ignition a lower-temperature nano-plasma is formed [2,3].

We perform classical molecular-dynamics calculations for the NIR-driven cluster system. The interaction with a weak VUV pulse is treated perturbatively and we investigate the trade-off between absorption and emission of VUV light from the irradiated nano-plasma.

1. T. Bredtmann et al., PRA 93, 021402(R) (2016)
2. A. Mikaberidze et al., PRA 77, 041201(R) (2008); PRL 102, 128102 (2009)
3. S.R. Krishnan et al. PRL 107, 173402 (2011)