Abstract
We investigate the multiphoton coherence effects on two weak probe-beam transitions in a five-level double-inverted Y system, where the two probe transitions are also affected by phase-dependent χ(3) processes occurring via Λ and Ξ channels. This system provides two channels to create each two-photon coherence and three-photon coherence. We show that quantum interference induced by the closed loop structure formed by excited states enhance the effect of two-photon coherence. Conditions on probe and control beam Rabi frequencies are provided to remove this quantum interference effect and achieve a balance between absorption induced by three-photon coherence and gain due to χ(3) processes either via two channels or via one channel. When the control beams forming double-Λ-configuration are out of phase with each other and so are the control beams forming double-Ξ-configuration, the probe beams are shown to undergo correlated absorption mainly due to χ(3) contribution. Also we present absorption profiles of both probe beams for moving atoms to show the multiphoton coherence effects.
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