Nonlinear laser interactions with saltwater aerosols

Dennis R. Alexander; Dana E. Poulain; Scott A. Schaub; John P. Barton

doi:10.1117/12.46766

1 September 1991 Nonlinear laser interactions with saltwater aerosols

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

Proceedings Volume 1497, Nonlinear Optics and Materials; (1991) https://doi.org/10.1117/12.46766
Event: Southcentral '91 (Dallas), 1991, Dallas, TX, United States

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.

Citation Download Citation

Dennis R. Alexander, Dana E. Poulain, Scott A. Schaub, and John P. Barton "Nonlinear laser interactions with saltwater aerosols", Proc. SPIE 1497, Nonlinear Optics and Materials, (1 September 1991); https://doi.org/10.1117/12.46766

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