title: Phase conjugation in a flame.
abstract: The first observation to our knowledge of degenerate four-wave mixing in a sodium-seeded flame is reported. In addition, the theoretical dependence of the phase-conjugate output on the sodium concentration is verified experimentally, demonstrating the potential of this procedure for use as a diagnostic tool to measure species concentration in combusting or noncombusting media.
authors.forename: J
authors.initials: J
authors.lastname: Pender
authors.forename: L
authors.initials: L
authors.lastname: Hesselink