We have observed a new component in the signals produced by degenerate four-wave mixing of 5-nsec optical pulses by the D-line resonances of sodium vapor. This component is comparable in intensity to that previously observed from a grating pattern of excited sodium atoms, but arises rather from a grating of coherently aligned (but not optically pumped) ground-state atoms. This component exists when there are no spatial intensity beats between input waves.
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Jabr et al. (1981) studied this question.
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