Abstract
We have performed picosecond transient-grating four-wave mixing experiments in a premixed, methane-air, sodium-seeded flame. Population gratings (in which the excitation beam polarizations are parallel) give exponential decays that are essentially independent of fringe spacing for medium-to-large spacings. These decays give a sodium excited-state lifetime of approximately 800 ps and a quenching collision cross section of approximately 0.2 µm2 A population-grating decay at a fringe spacing of 13.6 µm is shown in Fig. 1(a).
© 1991 Optical Society of America
PDF ArticleMore Like This
W. M. Schreiber and N. Chencinski
WQ4 OSA Annual Meeting (FIO) 1991
J.P. Singh and F.Y. Yueh
TuA4 Laser Applications to Chemical Analysis (LACSEA) 1992
RICK TREBINO and LARRY A. RAHN
THII4 International Quantum Electronics Conference (IQEC) 1987