Abstract
We theoretically investigate optical bistability (OB) and multistability(OM) behaviour of a closed-loop configuration atomic system driven by adegenerate coupling field and a degenerate probe field inside aunidirectional ring cavity. It is found that the OB and OM behaviour canbe controlled by adjusting the intensity and the frequency detuning ofthe coupling field, respectively. Interestingly, our numerical resultsshow that it is easy to realize the transition from OB to OM or viceversa by adjusting the intensity of the coupling field under aappropriate frequency detuning. The effect of the atomic cooperationparameter on the OB behaviour is also discussed.
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