Phase dependence of collective fluorescence via interferences from incoherent pumping

Abstract

We investigate the resonance fluorescence from a collection of three-level V- or Λ-type atoms which are driven simultaneously by coherent and incoherent sources of light. In particular, we focus on interference effects arising from broadband incoherent pump fields. This interference, which does not require non-orthogonal transition dipole moments, induces a sensitivity to the relative phase of the coherent driving fields. It is shown that the variation of the relative phase leads to interesting modifications of the collective steady-state behaviors of the two systems.