Abstract
Resonant degenerate four-wave mixing (DFWM) is currently the subject of intensive investigation as a sensitive diagnostic tool for molecular gas species.1 In uses involving luminous or high-pressure reacting gases, DFWM has the advantage of generating a coherent (beamlike) signal, providing excellent immunity to background light, and efficient collection despite limited optical access. While the technique of coherent anti-Stokes Raman scattering (CARS) shares this characteristic, DFWM typically makes use of one- photon resonances and is therefore much more sensitive than CARS.1
© 1992 Optical Society of America
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