Laser plasma formation using dual pulse pre-ionization

Ciprian Dumitrache, Nick Wilvert, Azer Yalin, Mikhail Shneider

Research output: Contribution to conferencePaperpeer-review

18 Scopus citations

Abstract

This contribution details an experimental and theoretical study of tailoring laser plasma temperature using two overlapped laser pulses of nanosecond duration. The method utilizes an ultraviolet pulsed laser beam to achieve pre-ionization, followed by a second, nearinfrared, superimposed pulse to provide energy addition in a controllable fashion through electron avalanche ionization (EAI). Experiments were conducted in atmospheric pressure air. It was observed during experiments, and through numerical simulations, that the preionization beam influences the breakdown threshold of the overlapped second beam. A subsequent study used laser Schlieren images as a diagnostic tool to aid the understanding of the temporal and spatial evolution of the breakdown kernel. Schlieren images of the overlapped ultraviolet and near-infrared beams were obtained at various time-delays for both breakdown and below breakdown conditions.

Original languageEnglish (US)
DOIs
StatePublished - 2013
Event44th AIAA Plasmadynamics and Lasers Conference - San Diego, CA, United States
Duration: Jun 24 2013Jun 27 2013

Other

Other44th AIAA Plasmadynamics and Lasers Conference
Country/TerritoryUnited States
CitySan Diego, CA
Period6/24/136/27/13

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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