Accession Number:

ADA218569

Title:

Nonlinear Spectroscopy of Multicomponent Droplets and Two- and Three- Dimensional Measurements in Flames

Descriptive Note:

Annual technical rept. 1 Jan-31 Dec 1989

Corporate Author:

YALE UNIV NEW HAVEN CT

Personal Author(s):

Report Date:

1990-01-15

Pagination or Media Count:

20.0

Abstract:

Our progress in the area of nonlinear spectroscopy of droplets includes the following 1 development of a fluorescent imaging technique which is capable of demarcating the liquid phase of the deformed and ejected droplets from the vapor phase of the ejected material 2 determination that the absorption of the laser-induced plasma quenches the stimulated Raman process and sets an upper limit on the incident intensity which can be used to generate stimulated Raman scattering SRS within droplets 3 completion of a statistical study of the SRS from single droplets which are irradiated at a fixed input laser intensity from a single-mode or a multi-mode laser 4 conclusion that, for single-mode laser excitation, SRS is pumped by the stimulated Brillouin radiation, not directly by the laser radiation and 5 initiation of studies on the phase-matching requirement for four-wave mixing processes in droplets and on the phase velocity of waves on a morphology- dependent resonance. Keywords Nonlinear optical diagnostics Fluorescence imaging Stimulated Raman scattering Phase-matching conditions Phase velocity of modes Laser diagnostics Turbulent flames Premixed flames Three- dimensional flow measurements Burning velocity.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE