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
Shuli Huo, Zhaoyang Zhang, Zhenkun Wu, Huaibin Zheng, Taikun Liu, Xinxin Xue, Jianping Song, and Yanpeng Zhang, "Observation of two multiwave mixing processes via dualoptical pumping channels," Chin. Opt. Lett. 9, 121902- (2011)