中文摘要：

研究了具有真空诱导相干的准∧型四能级原子系统中Doppler展宽以及探测场和驱动场之间的相对相位≠对瞬态演化的影响。研究结果表明：相对相位对无反转增益（GWI）的瞬态演化规律有明显的影响，对泵浦场和驱动场增益（吸收）的瞬态演化规律只有很小的影响；Doppler展宽宽度D值的改变也对相位相关的GWI的瞬态演化有显著的调制作用；在Ф取固定值的情况下，D值越大，增益达到稳定值所需的演化时间越长；D值不同时，达到增益极大值的演化时间也不同；最大瞬态增益和最大稳定增益并不对应相同的D值；选取适当的Ф和D值，存在Doppler展宽时可以得到比无Doppler展宽时更大的增益；当存在Doppler展宽时，光场的传播方向对相位相关的GWI瞬态演化也有显著的影响，探测场与驱动场传播方向相同时比传播方向相反时可以获得更大的GWI。

英文摘要：

The influence of Doppler broadening and relative phase between probe and driving fields on transient evolution in a quasi ∧ -type four-level atomic system with spontaneously generated coherence is studied. It is shown that the relative phase （Ф） has an obvious effect on transient evolution rule of gain without inversion （GWI） but just a small effect on transient evolution rule of gains （absorptions） of the pumping and driving fields;the variation of the Doppler broadening width （D） also has a considerable modulation role on phase-dependent transient evolution of GWI;for a fixed value of Ф, with D increasing, the time needed to Obtain steady GWI becomes longer;for different values of D,the time needed to obtain maximum GWI is also different;the value of D corresponding to the largest transient GWI is different from that corresponding to the largest steady GWI; when Doppler broadening appears, larger GWI can be obtained by choosing suitable values of φ and D, and propagation directions of the probe and driving fields also have a remarkable effect on phase-dependent transient evolution of GWI;when the propagation directions of the probe and driving fields are the same, a larger GWI can be obtained.