Abstract
In recent experiments1 we observed collision- induced resonances between ground-state hyperfine and Zeeman levels of Na atoms in a flame. At high intensities, both the Zeeman and hyperfine lines broaden, and additional spectral lines appear at frequency differences of one-half of the hyperfine splitting (see Fig. 1). The spectral lines at δ = 0 and ±0.059 cm−1 are four-wave-mixing resonances due to Zeeman and hyperfine coherences, respectively. The subharmonic resonances are observed at δ = ±0.03 cm−1 and cannot be explained by any known four-wave-mixing process. We report additional experiments using a six- wave-mixing beam geometry that suppresses four- wave-mixing effects and demonstrate that these additional spectral lines are due to six-wave-mixing processes of the form 2ω1 − ω2 + ω2 − ω2.
© 1987 Optical Society of America
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