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The laser amplication four-level atom system without inversion is studied.

对于小信号探测利用计算机给出吸收、增益曲线，并计算出无粒子数反转光放大的阈值条件。

By using the density matrix equations motion of the system,the conditions for realizing the probe fields gain without inversion in the system are discussed.

研究了三能级原子与多模光场相互作用的量子系统,从系统的密度矩阵运动方程出发讨论了无粒子数反转探测场的增益条件,发现当驱动场拉比频率取5,探测场拉比频率取1,非相干抽运取3,驱动场失谐量取3时,系统可以在偏离共振的两端获得粒子数无反转而相应的探测场获得了增益,即实现了无粒子数反转激光,其在光通信方面具有重要的应用价值。

In the strong driving field approximation,we discussed the conditions for realizing noninversion lasing in an open V type three level system.

在强驱动场近似下讨论了开放的Ｖ型三能级系统中实现无粒子数反转激光的条件，分析了系统增益大小跟驱动场Ｒａｂｉ频率，自发衰减率，原子注入速率比以及原子与探测激光场相互作用后从腔中排出速率之间的关

The comparison of steady-state gain of V-type and Λ-type atomic systems of lasing without inversion;

稳态V型和Λ型无粒子数反转激光增益的比较研究

Under resonance of corresponding fields, the physical mechanism of lasing without inversion (LWI) was discussed and its linear analytical solution was obtained.

结果表明:适当的自发衰减速率、调节非相干泵浦速率、粒子注入速率和粒子退出速率可获得无粒子数反转激光;线性和非线性的增益和粒子数差随驱动场Rabi频率的变化趋势一样,增益的线性稳定值大于非线性稳定值。