For the case of the off two-photon resonance, optical multistability occurs in the present system.The hysteresis loop widths are manipulated simply by varying the Rabi frequency of the coherent field.

• 在非双光子共振情况下，系统呈现多稳态，并且多稳态的驰豫环宽度也随相干场的拉比频率的变化而变化。