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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper QTuI33

High-resolution degenerate four-wave mixing in OH in the pump-saturation regime

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Abstract

Degenerate four-wave mixing (DFWM) spectra of the R1(9) A2Σ+-X2Π (0, 0) transition of OH have been measured with a resolution of ~0.002 cm−1 by using a frequency-doubled pulse-amplified cw dye laser. The measurements were made in the phase-conjugate geometry in the postflame gases of a premixed hydrogen/oxygen flat flame. Although an interest in phase-conjugate optics has motivated considerable work on atomic systems, our interest is motivated by the demonstration of DFWM as a practical diagnostic of radical molecules in combustion processes.1,2 Large signals have been observed that are simply interpreted when the pump lasers are above the saturation intensity.2

© 1991 Optical Society of America

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