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Title: Temporal evolution of femtosecond laser induced plasma filament in air and N{sub 2}

We present single shot, high resolution, time-resolved measurements of the relaxation of laser induced plasma filaments in air and in N{sub 2} gas. Based on the measurements of the time dependent electromagnetic signal in a waveguide, an accurate and simple derivation of the electron density in the filament is demonstrated. This experimental method does not require prior knowledge of filament dimensions or control over its exact spatial location. The experimental results are compared to numerical simulations of air plasma chemistry. Results reveal the role of various decay mechanisms including the importance of O{sub 4}{sup +} molecular levels.
Authors:
; ;  [1] ; ;  [2]
  1. Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel)
  2. Plasma Division, Naval Research Lab, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
22217760
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; COMPUTERIZED SIMULATION; CONTROL; ELECTRON DENSITY; LASERS; NITROGEN; PLASMA DENSITY; PLASMA FILAMENT; PLASMA PRODUCTION; PROBES; RELAXATION; SIGNALS; TIME RESOLUTION; WAVEGUIDES