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Chinese Optics Letters

Optical bistability and multistability via multi-Raman-channel interference

郭洪菊 Hongju Guo, 汪丽春 Lichun Wang, 钮月萍 Yueping Niu, 金石琦 Shiqi Jin, 龚尚庆 Shangqing Gong

Published Jan 1, 2009• 1 citation
Publisher

Abstract

We investigate the optical bistability and multistability behaviors in a closed three-level Λ-type atomic system.By adding a sideband on either hand of the transitions which are originally coupled by a coherent control field and a coherent probe field to disturb the two-photon resonance, bistability occurs due to two-channel interference.Increasing the sideband Rabi frequency leads to the switching from bistability to tristability.When the sideband simultaneously couples with both hands, we can easily obtain quadrastability.

DOI
10.3788/col20090708.0659

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We investigate the optical bistability and multistability behaviors in a closed three-level Λ-type atomic system.By adding a sideband on either hand of the transitions which are originally coupled by a coherent control field and a coherent probe field to disturb the two-photon resonance, bistability occurs due to two-channel interference.Increasing the sideband Rabi frequency leads to the switching from bistability to tristability.When the sideband simultaneously couples with both hands, we can easily obtain quadrastability.
We investigate optical bistability (OB) and optical multistability (OM) behaviors in a triply driven five-level atomic system.It is shown that the system has bistable behavior and can be controlled by intensity of applied fields.We find that OB switches to OM via interference induced among the Rabi-split resonance.We consider a superposed one-dimension standing wave, generated by two optical fields, and it is demonstrated that the OB and OM behaviors depend on the position of localized atoms as well as the relative phase of applied fields.
We theoretically investigate the behaviour of optical bistability (OB) and optical multistability (OM) in a generic double two-level atomic system driven by two orthogonally polarized fields (a π-polarized control field and a σ-polarized probe field). It is found that the behaviour of OB can be controlled by adjusting the intensity or the frequency detuning of the control field. Interestingly enough, our numerical results also show that it is easy to realize the transition from OB to OM or vice versa by adjusting the relative phase between the control and probe fields. This investigation can be used for the development of new types of devices for realizing an all-optic switching process.
The optical bistability (OB) and multistability (OM) in chiral molecules are investigated by placing the sample into a unidirectional ring cavity. Because of broken mirror symmetry of the effective potential, the chiral molecules have a cyclic three-level Δ-configuration structure, in which one- and two-photon transitions can coexist. We find that the OB is achievable in this system on exact one-, two- and three-photon resonance conditions but absent in the three-level Λ-type system under the two-photon resonance. Moreover, the OM and the switching between OB and OM are also realized by choosing parameters properly. Interestingly, the left- and right-handed chiral molecules exhibit different bistable and multistable behaviors. It is shown that the threshold intensity of OB is strongly dependent on the percentage of the two enantiomers in the mixture. This provides an effective approach to probe molecular chirality and to determine enantiomer excess, which may find potential application in organic chemistry, pharmacology, biochemistry, etc..
The optical behavior of a four-level system in a ring cavity driven by two coherent laser fields is studied. One laser field is treated as the incident field and the other the control field, respectively. It is found that there is optical transparency when the difference between the two frequency detunings of the incident and control fields from the corresponding atomic transition frequencies is zero. Optical bistability can be produced and controlled by increasing the magnitude of the frequency difference. The bistable hysteresis becomes larger when the frequency difference is increased. Further increase of the latter can lead to onset of multistability.
The steady-state optical bistability(OB) and optical multistability(OM) behavior in the quasi——type atomic system driven by a probe field and a coherent coupling field inside a unidirectional ring cavity are shown,and the effects of coupling-field detuning and coupling-field intensity on the OB and OM behavior are investigated. The transition from OB to OM or vice versa is found by varying the detuning of the coherent coupling field or by adjusting the intensity of the coupling field. The influence of the atomic cooperation parameter on the OM behavior is also discussed.