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Acta Sinica Quantum Optica

The EIT Effects and Optical Switch of Tripod-type Four-level Atom System

Jun Zheng

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

The quantum effects of a tripod-type four-level atom system interacting with three light fileds are studied.Under certain conditions,our calculations show that along with the change of Rabi frequencies of the driving field,the curve of dispersion changes from abnormal chromatic dispersion to normal chromatic dispersion,thus the optical switching effect has appeared.When the parameter is certain,there is a phenomenon of electromagnetic induction transparency in resonance near resonance case.

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The quantum effects of a tripod-type four-level atom system interacting with three light fileds are studied.Under certain conditions,our calculations show that along with the change of Rabi frequencies of the driving field,the curve of dispersion changes from abnormal chromatic dispersion to normal chromatic dispersion,thus the optical switching effect has appeared.When the parameter is certain,there is a phenomenon of electromagnetic induction transparency in resonance near resonance case.
The quantum effects of a tripod-type four-level atom system interacting with three light fileds are studied.Under certain conditions,the author's calculations show that with the change of Rabi frequencies of the driving field,the curve of dispersion can transformed from abnormal chromatic dispersion to normal chromatic dispersion,thus the optical switching effect has appeared.When the parameter is certain,there is a phenomenon of electromagnetic induction transparent in resonance-near resonance case.
In this paper we study the quantum interference effects of a quasi-Λ-type four-level atom system interacting with two light fields. When the probe field is weak, our calculations show that along with the change of Rabi frequencies of the driving field, the system appears to be hole burning in the dispersion curve,and two big electromagnetic induced transparency windows with approximately the same width are demonstrated. In addition, the evolution of dispersion with the Rabi phase of probe field shows optical bistability.
The susceptibility of the probe field in a four-level tripod-type atomic system as a function of the probe detuning is calculated.The results show that the absorption and dispersion of probe field near EIT resonance can be significantly changed while a trigger beam interacting with a transition in this system.With the increase of Rabi frequency of trigger beam,the absorption of probe beam at EIT window becomes smaller,and its dispersion becomes larger.Such changes of susceptibility of probe beam caused by a trigger beam are corresponding to the third Kerr nonlinearity,which have an application in polarization phase gate.
The electromagnetically induced transparency (EIT) phenomenon in a four level atomic system with tripod configuration is studied. The results show that this configuration is equivalent to the combination of two single three-level ΛΛΛ configurations, which, under certain conditions, results in the so-called double-EIT (DEIT) phenomenon. The properties of the double transparency windows for DEIT are discussed in detail and the possible experimental scheme is proposed.
Using numerical simulation methods,the properties of the absorption and dispersion of probe field in a four-level atomic system with two driving fields are analyzed.Under the condition of resonance,electromagnetically induced transparency(EIT) can appear in this system by adjusting the Rabi frequency of the coherent fields.Furthermore,the phenomenon of performance gain can be obtained by choosing appropriate parameters.Meanwhile,lasing without inversion(LWI) can be explicitly realized in this closed system.
The optical properties of a five-level atomic system composed of a 'Lambda'-type four-level atomic and a tripod four-level atomic systems are investigated. It is found that the behaviors of electromagnetically induced transparency (EIT) and group velocity can be controlled by choosing appropriate parameters with the interacting dark resonances. In particular, when all the fields are on resonance, the slow light at the symmetric transparency windows with a much broader EIT width is obtained by tuning the intensity of the coupling field in comparison with its sub-system, which provides potential applications in quantum storage and retrieval of light.