Abstract
We look at the effects of population transfer on parametric four-wave mixing (PFWM) in Na vapor. We show experimentally that, during the laser pulse, phase matching conditions necessary for the generation of axial PFWM1 are destroyed by population transfer. Shortening of the PFWM pulse with respect to the laser pulse length is observed. In addition, by use of counterpropagating laser beams wherein the degree of temporal and spatial overlap in the medium is controlled, we show how simple measurements can provide direct evidence of population transfer spoiling of PFWM production.
© 1989 Optical Society of America
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