  We experimentally investigate the effectiveness of the four-wave mixing
suppression in a double-lambda interaction scheme by introducing an additional
ladder-type two-photon Raman absorption resonance for one of the optical
fields. We propose several possible interaction configurations involving either
one or two isotopes of Rb, and experimentally demonstrate the possibility of
efficient four-wave mixing suppression in both EIT and far-detuned Raman cases.

Optics