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Optical and Quantum Electronics

Coherent control of spatially structured multi-wave mixing induced optical properties in atomic medium

Shakir Ullah, Muhammad Haneef, Ayesha Samreen, Hamdi Ayed

Published Jul 30, 2024• 0 citations
Publisher
DOI
10.1007/s11082-024-07283-w

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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.
On the basis of coherently induced photonic gap structures,a new all-optical routing control scheme is proposed to simultaneously control the propagation dynamics of two weak light signals.With the transfer-matrix method to describe the coherent scattering of light waves in periodic media and the density-matrix equations to describe the resonant interaction between monochromatic laser fields and multi-level atoms,the steady reflection and transmission spectra are calculated for a coherently driven ultra-cold atomic ensemble as the control medium.The results show that,by changing the spatial patterns,intensity,and frequencies of two strong laser fields,a pair of special frequency bands(with ~95% reflectivity or ~95% transmissivity) can be first established near the probe resonance and then be manipulated at any time to induce two weak light signals of different frequencies into the desired network channels.This scheme well satisfies the basic requirements of low-deformation and low-loss for all-optical routing control of weak light signals in the field of quantum information processing.
We propose a multi-field-coupled atomic model that exhibits controllable symmetricsymmetricsymmetric and asymmetricasymmetricasymmetric evolution of significantly enhanced diffraction peaks 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 super symmetric alignment of the diffraction peaks 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 high-precision atomic lithography.