Abstract
We have observed four-wave mixing(FWM) of weak pumping in a resonance double-Λ system for the 5S1/2 – 5P1/2 transition of 87Rb atoms. When three beams(CPT1, CPT2 and pump) were co-propagated in the double-Λ configuration composed of the common excited state 5P1/2(Fe=2) and the two ground state 5S1/2(Fg=1 and 2), we directly measured the generated FWM signal filtering the three beams using polarizer and etalon filters. The spectral width of FWM signal was measured to be ~10 kHz under the condition of coherent population trapping(CPT). Dependence of FWM signals on the intensities of the two beams related CPT and pump beam was investigated in detail.
© 2015 IEEE
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