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Linearity of charge measurement in laser filaments

Published in Optics express. 2017, vol. 25, no. 14, p. 16517-16526
Abstract We evaluate the linearity of three electric measurement techniques of the initial electron density in laser filaments by comparing their results for a pair of filaments and for the sum of each individual filament. The conductivity measured between two plane electrodes in a longitudinal configuration is linear within 2% provided the electric field is kept below 100 kV/m. Furthermore, simulations show that the signal behaves like the amount of generated free electrons. The slow ionic current measured with plane electrodes in a parallel configuration is representative of the ionic charge available in the filament, after several $mu$s, when the free electrons have recombined. It is linear within 2% with the amount of ions and is insensitive to misalignment. Finally, the fast polarization signal in the same configuration deviates from linearity by up to 80% and can only be considered as a semi-qualitative indication of the presence of charges, e.g., to characterize the filament length.
Keywords Ultrafast nonlinear opticsPlasmasPlasma diagnostics
arXiv: 1708.04510
Note 17 pages, 7 figures
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Article (Accepted version) (585 Kb) - public document Free access
Research groups Groupe Kasparian
Groupe Wolf
ISE Climat
ISE Pôle Sciences
European Commission: FILATMO
(ISO format)
MONGIN, Denis et al. Linearity of charge measurement in laser filaments. In: Optics Express, 2017, vol. 25, n° 14, p. 16517-16526. doi: 10.1364/OE.25.016517 https://archive-ouverte.unige.ch/unige:96317

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Deposited on : 2017-08-28

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