Abstract

We demonstrate very high-contrast coherent population trapping[1] (CPT) resonances by using four-wave mixing in Rb87 atoms. In the experiment, we take advantage of the spectral overlap between F=2F and F=3F optical resonances on the D1 line of Rb87 and Rb85 atoms, respectively, to eliminate the DC-light background from the CPT resonance signal. We observe a CPT resonance with a contrast in the range of 90%, compared with a few percent achieved by alternative methods.

© 2007 Optical Society of America

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