Abstract
Based on double optical pumping channels, we experimentally study the
competition between two coexistent six-wave mixing (SWM) processes falling into two
electromagnetically induced transparency windows by scanning the frequency of the
probe field in two similar five-level atomic systems of <sup>85</sup>Rb. By blocking one
optical pumping channel unrelated to the four-wave mixing (FWM) process, one SWM
process, together with the FWM process, generated by a conjugated small-angle static
grating could be observed in the spectrum. Moreover, the other SWM process obtained
by blocking the first SWM channel is also observed together with the FWM process in
a lower N-type four-level subsystem. These experimental results agree well with
theoretical predictions.
© 2011 Chinese Optics Letters
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