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We experimentally demonstrate coherent amplification of probe field in atripod-type atoms driven by strong coupling, signal and weak probe fields. Wesuppress linear and nonlinear atomic absorptions for resonant and near resonantprobe via double electromagnetically induced transparency (DEIT). Combiningthese advantages of suppressed absorption along with temperature- oratomic-density-controlled transfer of population(ToP) between hyperfine groundstates, we can induce near-resonant amplification of probe through stimulatedRaman scattering(SRS) pumped by low-intensity signal field. The increasedpopulation difference of initial and final states of SRS due to increased ToPrate, together with reduced absorption at the second EIT window in an opticallythick Cesium vapor, gives rise to highly effective coherent amplification.

Strong Coherent Light Amplification with Double Electromagnetically Induced Transparency Coherences