双控制场四能级系统的吸收与色散特性

通过求解准∧-型四能级系统的密度矩阵方程，研究微波场和耦合场对探测场吸收和色散性质的影响．当微波场和探测场作用于该能级系统中时，随着微波场拉比频率的增大，使得探测场共振频率处的吸收逐渐减弱，此位置处的色散特性也随拉比频率的增加由反常色散转变为正常色散．当微波场与耦合场均为强场时，通过不同的组合方式，研究探测场的吸收和色散性质．

The Absorption and Dispersion Properties in the Four-level System with Two Controlling Fields

The absorption and dispersion properties of the probe field were investigated along with the parameters of the coupling field and the microwave field by numerically solving the density matrix equation of the quasi- ∧-four-level system. It is shown that as the microwave field Rabi frequency increasing, the probe field absorption of the resonanee frequency position decreased gradually, and the dispersion property was also influenced which the switching from anomalous dispersion to normal dispersion can be observed. Both microwave field and coupling field were strong fields, the effect of two fields on the probe absorption and dispersion can be obtained by changing the parameters of two fields.