中文摘要：

利用密度矩阵运动方程和光场传播方程的数值计算结果，研究在Doppler展宽的开放的V型三能级无反转激光（LWI）系统中自发辐射诱导相干（SGC）对传播效应的影响及原子退出速率（r0）和注入速率比（s）对SGC相关的传播效应的调制作用，以寻找获得更大LWI增益和探测场强度的途径。研究结果表明，随着传播距离的增加，IWI增益和探测场Rabi频率（强度）先增大后减小，驱动场Rabi频率（强度）单调减小；SGC强度（用θ量度）越大，LWI增益和探测场Rabi频率（强度）越大；当θ=π时，可得到最大的LWI增益和探测场Rabi频率（强度）；有SGC时可获得比无SGC时大得多的LWI增益和探测场Rabi频率（强度）；在托和s的一定数值范围内，LWI增益和探测场Rabi频率（强度）随r0和s取值的增大而增大；选择适当的托和s的数值大小，在开放系统中可获得远高于相应封闭系统的LWI增益和探测场Rabi频率（强度）。

英文摘要：

In this paper we study the influence of spontaneously generated coherence （SGC） on propaga tion effect and the modulation role of the atomic exit rate （r0）and ratio （S） of the atomic injection rates on the SGC-dependent propagation effect in an open V-type threeqevel lasing without inversion （LWI） system with Doppler broadening, by using the calculation results of the density matrix motion equations and the propagation equations of the driving and probe fields,in order to get larger LWI gain and intensi- ty of the probe field. It is shown that with propagation distance increasing,LWI gain and Rabi frequency （intensity） of the probe field first increase and then decrease,while the Rabi frequency （intensity） of the driving field decreases monotonously; LWI gain and Rabi frequency （intensity） of the probe field increase with SCA2 strength （measured by θ） increasing. When θ=π, we can obtain the largest LWI gain and Rabi frequency （intensity） of the probe field;in the case with SCA2,we can get much larger LWI gain and Rabi frequency （intensity） of the probe field than those in the case without SC, C. In certain value ranges of r0 and S, LWI gain and Rabi frequency （intensity） of the probe field increase with r0 and S increasing. By choosing proper values of r0 and S,in the open system we can obtain much higher LWI gain and Rabi frequency （intensity） of the probe field than those in the corresponding closed system.