Nonlinear laser interactions with saltwater aerosols

Dennis R. Alexander, D. E. Poulain, Scott A. Schaub, John P. Barton

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Intensity ratios of the resonant Na(λ = 589 nm) to Hα (λ = 656 nm) emission lines have been measured for 10 GW/cm2 KrF laser radiation (λ = 248 nm, tpulse = 17 ns) interacting with 50 μm diameter saltwater droplets as a function of position in the breakdown region parallel to the incident laser beam. Results indicate the Hα emission intensity is highly non-uniform through the plasma plume and is highest in the plume ejected back toward the laser beam. In contrast, the Na emission line intensity shows a much weaker spatial dependence as a function of position within the plasma plume. Calibration data are also reported for the ratio of Na to Hα emission intensities as a function of Na concentration (0-2000 ppm) for ≈ 20 μm diameter monodisperse droplets located at a fixed observation point in the plasma plume. Future research will extend the ratioing technique to remotely measure droplet salt concentrations in polydisperse saltwater sprays.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherPubl by Int Soc for Optical Engineering
Number of pages8
ISBN (Print)0819406066
StatePublished - 1991
EventNonlinear Optics and Materials - Dallas, TX, USA
Duration: May 8 1991May 10 1991

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherNonlinear Optics and Materials
CityDallas, TX, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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