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Proceedings Paper

Nonlinear laser interactions with saltwater aerosols
Author(s): Dennis R. Alexander; Dana E. Poulain; Scott A. Schaub; John P. Barton
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Paper Abstract

Intensity ratios of the resonant Na((lambda) equals 589 nm) to H(alpha ) ((lambda) equals 656 nm) emission lines have been measured for 10 GW/cm2 KrF laser radiation ((lambda) = 248 nm, tpulse equals 17 ns) interacting with 50 micrometers diameter saltwater droplets as a function of position in the breakdown region parallel to the incident laser beam. Results indicate the H(alpha ) 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 H(alpha ) emission intensities as a function of Na concentration (0-2000 ppm) for approximately equals 20 micrometers 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.

Paper Details

Date Published: 1 September 1991
PDF: 8 pages
Proc. SPIE 1497, Nonlinear Optics and Materials, (1 September 1991); doi: 10.1117/12.46766
Show Author Affiliations
Dennis R. Alexander, Univ. of Nebraska/Lincoln (United States)
Dana E. Poulain, Univ. of Nebraska/Lincoln (United States)
Scott A. Schaub, Univ. of Nebraska/Lincoln (United States)
John P. Barton, Univ. of Nebraska/Lincoln (United States)

Published in SPIE Proceedings Vol. 1497:
Nonlinear Optics and Materials
Cyrus D. Cantrell; Charles M. Bowden, Editor(s)

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