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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper QFC1

Picosecond four-wave mixing in sodium-seeded flames

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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

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