The effect of ambient pressure on laser-induced plasmas in air

Research output: Contribution to journalArticlepeer-review

Abstract

A detailed investigation of the effect of ambient pressure in the range of 0.1 to 1.0 atm on the size, temperature, electron number density, and fraction of laser energy absorbed in a laser-induced plasma in air has been conducted. As pressure is reduced the size of the plasma, its electron number density, its peak emission intensity, and the fraction of incident laser energy that is absorbed are all found to decrease significantly. The temporal temperature profile in the plasma and the fraction of the absorbed laser energy that is converted to thermal energy in the plasma remain constant, at least down to 0.2 atm.

Original languageEnglish (US)
Pages (from-to)27-35
Number of pages9
JournalOptics and Lasers in Engineering
Volume45
Issue number1
DOIs
StatePublished - Jan 2007

Keywords

  • LIBS
  • Laser spark
  • Pressure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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