Scientific article
Open access

Linearity of charge measurement in laser filaments

Published inOptics Express, vol. 25, no. 14, p. 16517-16526
Publication date2017

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.

  • Ultrafast nonlinear optics
  • Plasmas
  • Plasma diagnostics
  • arxiv : physics.plasm-ph
Note17 pages, 7 figures
  • European Commission - Laser Filamentation for Probing and Controlling Atmospheric Processes [291201]
Citation (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
Main files (1)
Article (Accepted version)
ISSN of the journal1094-4087

Technical informations

Creation08/26/2017 10:43:00 PM
First validation08/26/2017 10:43:00 PM
Update time03/15/2023 1:57:22 AM
Status update03/15/2023 1:57:22 AM
Last indexation10/19/2023 4:17:05 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack