Rahn LA, Brown MS. Polarization properties of degenerate four-wave mixing in flame OH.
OPTICS LETTERS 1994;
19:1249-1251. [PMID:
19855485 DOI:
10.1364/ol.19.001249]
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Abstract
The polarization properties of backward-box, degenerate four-wave mixing from OH molecules are measured in a flame and compared with theory. Ratios of signal intensities for different laser polarizations are shown to exceed perturbation-theory predictions for a closed two-level system when optical intensity gratings are formed in the interaction volume. These results are shown to be inconsistent with population-nonconserving effects and are attributed to scattering from quenching-induced thermal density gratings.
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