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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 27 — Sep. 20, 2002
  • pp: 5804–5813

Time-resolved studies of the interactions between pulsed lasers and aerosols

Cindy L. DeForest, Jun Qian, and Roger E. Miller  »View Author Affiliations


Applied Optics, Vol. 41, Issue 27, pp. 5804-5813 (2002)
http://dx.doi.org/10.1364/AO.41.005804


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Abstract

Studies of the interaction between a pulsed CO2 laser and micrometer-sized aqueous and organic particles by use of light-scattering methods and step-scan Fourier-transform infrared (FTIR) spectroscopy are reported. Visible two-color extinction experiments indicate primary particle shattering, accompanied by a high fraction of vaporization, followed by secondary particle evaporation. The extent of the latter depends on the pulse intensity and particle composition. Angle-resolved light-scattering investigations provide insight into the aerosol size distribution and temperature following the pulsed heating event. The time dependence of the vapor plume, monitored with step-scan FTIR spectroscopy, confirms that a large fraction of the initial particle is quickly evaporated during the shattering event, followed by secondary fragment evaporation and thermal expansion.

© 2002 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(140.3470) Lasers and laser optics : Lasers, carbon dioxide
(290.5850) Scattering : Scattering, particles
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6500) Spectroscopy : Spectroscopy, time-resolved

History
Original Manuscript: December 11, 2001
Revised Manuscript: June 10, 2002
Published: September 20, 2002

Citation
Cindy L. DeForest, Jun Qian, and Roger E. Miller, "Time-resolved studies of the interactions between pulsed lasers and aerosols," Appl. Opt. 41, 5804-5813 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-27-5804

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