Abstract
We propose an atomic model in close-loop configuration, which exhibits controllable symmetric and asymmetric evolution of significantly enhanced diffraction peaks of the weak probe beam in an opto-atomic grating at far-field regime. Such results are obtained by the linear and nonlinear modulation of the intensities of the diffraction peaks as a result of multi-wave-mixing-induced modification of spatially modulated coherence in a closed four-level atomic system. Novelty of the results lies in predicting the diffraction pattern with uniform peak height due to the dominance of the amplitude part of the grating-transfer-function at the condition of exact atom-field resonance, which is unique to the present model. Efficacy of the present scheme is to apply it in producing nonlinear light generated by four-wave-mixing-induced control of spatially modulated coherence effect. The work also finds its importance for its applicability in the field of all-optical devices.
Highlights
We propose an atomic model in close-loop configuration, which exhibits controllable symmetric and asymmetric evolution of significantly enhanced diffraction peaks of the weak probe beam in an optoatomic grating at far-field regime
Electromagnetically Induced Grating (EIG) in terms of spatially modulated Electromagnetically Induced Transparency (EIT) or DEIT has been analyzed in Refs.[4,5,6,7,8,13,14,18,20,22,23,24,25] and EIG based on Electromagnetically Induced Absorption (EIA) has been explained in Ref.[5,17]
We have studied nonlinear modulation effect on the diffraction pattern of EIG as a result of spatially modulated four-wave-mixing induced coherence effect in a four-level close-loop interaction system
Summary
We propose an atomic model in close-loop configuration, which exhibits controllable symmetric and asymmetric evolution of significantly enhanced diffraction peaks of the weak probe beam in an optoatomic grating at far-field regime. The phenomena like Electromagnetically Induced Transparency (EIT)[9], double-EIT (DEIT)[10], Electromagnetically Induced Absorption (EIA)[11], laser-controlled Decay Interference Induced Coherence (DIIC)[12] may lead to obtain spatially modulated atomic coherence under the standing-wave field configuration Owing to such coherence effects, a number of works[4,5,6,7,8,13,14,15,16,17,18,19,20,21,22,23,24,25,26] have presented EIG in various atomic models. In a tripodtype atomic model the appearance of dual EIG is reported in the presence of an incoherent pump field[45]
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