Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 3: Ultrashort Laser Pulses

Q 3.1: Talk

Monday, March 5, 2018, 10:30–10:45, K 0.023

Noncollinear third harmonic generation in MgO — •Dennis Mayer, Axel Heuer, and Markus Gühr — Institut für Physik und Astronomie, Universität Potsdam

In a recent study You et al. observed that harmonic generation in MgO is sensitive to the crystal structure and that the polarization dependent efficiency exhibits additional features in the strong field regime [1]. In contribution to this study we report the observation of intensity- and polarization-dependent far field patterns in the perturbative third harmonic generation in MgO. Using 400fs pulses from an Yb-based laser we observed a transition from collinear to different non-collinear emissions depending on the pump-pulse polarization at intensities of 10¹¹ W/cm². The emission is locked to the Mg-O direction inside the crystal for linear polarization and occurs in a cone for circular polarization. Since this transition is irreversible for a given polarization and does not occur for pulse durations below 100fs, we attribute this effect to stress-induced damage inside the crystal.

[1] Y.S. You et al., Nature Physics AOP (2016)