Open Access1D time evolving electric field profile measurements with sub-ns resolution using the E-FISH method
Author(s) -
Benjamin M. Goldberg,
Stephan Reuter,
Arthur Dogariu,
Richard B. Miles
Publication year - 2019
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.44.003853
Subject(s) - optics , electric field , fish <actinopterygii> , resolution (logic) , field (mathematics) , physics , remote sensing , computer science , geology , mathematics , quantum mechanics , artificial intelligence , fishery , pure mathematics , biology
We present an approach for the measurement of time evolving electric field profiles in atmospheric pressure plasma discharges using electric field induced second harmonic generation (E-FISH). While the E-FISH effect has been known of for some time, recent advances in laser and detection technology have allowed the method to be utilized for spatial measurements of an arbitrarily applied electric field. A cylindrical lens is used to focus the femtosecond laser light to a line and an intensified charge coupled device is used for detection, allowing for one-dimensional (1D) spatial resolution on the order of ∼50 μm. Measurements have been carried out verifying the spatial resolution using a spatially periodic, localized electric field. Calibrated 1D electric field measurements have been completed with a time resolution of 500 ps in a laminar cold atmospheric pressure plasma jet with argon core flow and N 2 co-flow powered by a nanosecond (ns) pulse dielectric barrier discharge. The field was shown to propagate as an ionization wave, with a velocity of ∼0.3 mm/ns.