Multiple-valued Corresponding Feature Due To Local Field Effects Of Two-Level Atoms

It is well known that quantum coherence and interference in atomic systems can lead to interesting optical phenomena.If the atomic density is small(10¹³atoms/cm³ or less) such that local field effects are unimportant.The dispersion-absorption relations of the media can be dramatically modified by employing coherent fields to drive it. There are different mechanisms to realize optical bistability.For example,via the phase or amplitude fluctuation of the driven field,via spontaneous emission induced coherence or via a squeezed vacuum input,etc.Appearance or disappearance of the bistability and multistability,manipulation of the hysteresis hoop widths,and switching between bistability and tristability are achieved simply by varying the sideband amplitudes or the sum of relative phase of the sidebands to the central component.These new effects have many potential applications in fundamental physics and applied physics.However,it may be possible to obtain much higher atomic densities in gaseous systems where effects from near dipole-dipole(NDD) interactions become important. In this paper,we discuss the influence of atomic nonlinearities due to local field effects. The field intensity output from optical cavity displays nonlinear Multiple-valued corresponding feature,i.e.,one input state corresponds to three stable output states and one output state corresponds to three stable input states.Meanwhile,optical multistability threshold value can be changed by varying coupling field parameters (strength,frequency,etc.)...