1D time evolving electric field profile measurements with sub-ns resolution using the E-FISH method

Goldberg, Benjamin M.; Reuter, Stephan; Dogariu, Arthur; Miles, Richard B.

doi:10.1364/ol.44.003853

Cited by 48 publications

(50 citation statements)

References 13 publications

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“…An important difference between eqns. (8) and ( 9) is that while the power contained in the probe beam is necessarily constant (assuming negligible depletion), the E-FISH power is in fact a function of .…”

Section: Governing Equations For a Focused Gaussian Beammentioning

confidence: 99%

Electric field measurements in plasmas: how focusing strongly distorts the E-FISH signal

Chng

Starikovskaia

Schanne-Klein

2020

Plasma Sources Sci. Technol.

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Electric field induced second harmonic generation (E-FISH) has recently demonstrated significant potential as a method for making absolute electric field measurements in non-equilibrium plasmas and gas discharges. Previous studies have relied on the plane-wave approximation in quantifying these measurements, while in reality, focused laser beams are almost always used. In this work, we perform a theoretical and experimental study using focused Gaussian beams, and examine the consequent effects on the E-FISH signal. We show that in addition to important parameters such as the external electric field strength, wave vector mismatch and Rayleigh range, the signal is strongly influenced by the full length and shape of this external field profile. We attribute this to the Gouy phase shift associated with focused beams, and note that analogous effects have been previously observed in second and third harmonic generation microscopy. This dependence of the E-FISH signal on the spatial profile of the external field is worth highlighting since it is often not easily determined a priori in a plasma, and neglecting its influence could lead to an incorrect electric field measurement. To minimize any inaccuracies associated with this issue, we propose several recommendations to consider when using the E-FISH diagnostic with focused beams.

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Section: Governing Equations For a Focused Gaussian Beammentioning

confidence: 99%

Electric field measurements in plasmas: how focusing strongly distorts the E-FISH signal

Chng

Starikovskaia

Schanne-Klein

2020

Plasma Sources Sci. Technol.

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“…In this respect, much attention is paid to measurements of electric fields inside APPJs. For this purpose, various methods have been used, based on the intensity ratio of the first negative and second positive systems of N 2 radiation [5], polarisation‐dependent Stark splitting and shifting of visible helium lines [6–11], Pockels technique [12–14], electric field‐induced second harmonic generation method [15, 16]. A number of measurements give, in the region of effluent adjacent to the tube end, nearly linear growth of the electric field along the helium APPJ axis [6, 8–11, 16].…”

Section: Introductionmentioning

confidence: 99%

Electric field distributions along helium plasma jets

Naidis

Babaeva

2020

High Voltage

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Results of simulations of streamers propagating along the atmospheric‐pressure helium plasma jets ejected from a thin tube into ambient air are presented. The computational model includes the equations governing the helium–air mixture composition along and across the jet, as well as the equations, describing streamer propagation in the mixture, for the electric field and the charged species densities. Streamer velocity and spatial–temporal profiles of plasma parameters are obtained for various values of the helium flow rate. It is shown, in agreement with available experimental data, that the electric field values in the heads of streamers increase nearly linearly with the distance from the tube exit and that the slope of this dependence decreases with the growth of the helium flow rate.

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“…Considerable progress has been made in electric field measurements by picosecond laser techniques of E-field measurements. We can mention four-wave mixing [119] and the Electric Field-Induced Second Harmonic (E-FISH) generation technique [120,121]. Time resolution is limited by the laser pulse duration and the registration technique (e.g., oscilloscope bandwidth) and is typically sub-nanosecond.…”

Section: Plasma-assisted Ignitionmentioning

confidence: 99%

Non-equilibrium plasma for ignition and combustion enhancement

2021

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This review is intended to give an overview of recent results on plasma-assisted ignition and combustion. The influence of electrical discharges on combustion processes is introduced, and the excited species and radicals present in large quantity in the plasma are detailed. A description of theoretical problems related to modeling plasma-assisted combustion is given, elucidating the role of excited states in enhancing the reaction rates. Then some experiments are reported, focused on fundamental aspects on the effects of high pressure discharges in improving the ignition of combustion. To conclude, some applications for plasma-assisted combustion and detonation are presented, activated by different kinds of discharges.

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1D time evolving electric field profile measurements with sub-ns resolution using the E-FISH method

Cited by 48 publications

References 13 publications

Electric field measurements in plasmas: how focusing strongly distorts the E-FISH signal

Electric field measurements in plasmas: how focusing strongly distorts the E-FISH signal

Electric field distributions along helium plasma jets

Non-equilibrium plasma for ignition and combustion enhancement

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