Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Poster Session 2

P 10.21: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Electric Field Measurements via EFISH in a CARS Setup — Jutta Püttman, Jan Kuhfeld, •Dirk Luggenhölscher, and Uwe Czarnetzki — Ruhr-University Bochum, Experimental Physics V, Germany

The electric field strength is a basic parameter of non-thermal plasmas since it determines the energy of the electrons which governs the discharge dynamics in high pressure plasmas. Further, if the electric field strength and its temporal development are known, this can be combined with additional diagnostics like voltage and current measurements to infer many other quantities of interest e.g. displacement and conduction current, dissipated power, and electron density. The electric field is measured by "Electric field induced second harmonic generation" (EFISH) [1] using the second harmonic of a pulsed Nd:YAG laser which is part of a more complex CARS setup for measuring the ro-vibrational distribution of N2 and CO2. The presence of an electric field induces an asymmetry in the polarizability of the gas which enables the otherwise forbidden generation of the second harmonic radiation. The method is species independent and allows for spatial and temporal resolved measurements in which the resolution is governed by the focal parameter and pulse duration of the laser. The method is characterized, calibrated and first measurements in an atmospheric pressure nanosecond pulsed discharge are presented.

[1] A. Dogariu, B. Goldberg, S. O'Byrne, and R. Miles, Phys. Rev. Appl. (2017) 024024