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Phase-dependent propagation in a two-level system with intermediate states
A. Sharypov , A. Eilam , A.D. Wilson-Gordon , H. Friedmann
Bar-Ilan University
We study the phase-dependent propagation of a strong, resonant pump and two weak symmetrically detuned fields in a two-level system with population decay through a cascade of intermediate levels. As this system forms a closed loop, the propagation is phase-dependent. We have demonstrate that for an initial total phase Φ=0, there is constructive interference between the two weak fields leading to parametric amplification on propagation. When Φ=π, destructive interference occurs leading to absorption of the weak fields on propagation. When the weak fields are initially equal in intensity, and Φ=0,π, Φ remains constant on propagation. For other initial phases, Φ changes on propagation. Dramatic phase changes from π to 0 can occur when the weak fields are initially unequal in intensity and Φ=π.