Nonlinear Spectroscopy of Multicomponent Droplets and Two- and Three- Dimensional Measurements in Flames
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1990
- Accession Number
- ADA218569
Entities
People
- Marshall B. Long
- Richard K. Chang
Organizations
- Yale University