结果表明：注入的二能级原子在不同方式下，原子的反转特性不一样。
The results show that the properties of the atomic inversion in different regimes are very distinct.
当上能级粒子数处于未反转分布态时，具有较大的发射截面与吸收截面比值的波长信道拥有相对较大的增益竞争优势。
When the upper state population is not reversed, the channel with greater ratio of emission and absorption cross-section has greater competitive advantage.
本文主要的探讨了无粒子数反转激光的物理机制，建议了一种封闭的四能级无反转激光模型，并证明它也能够呈现无粒子数反转光放大现象。
This thesis mainly discusses the physics mechanism of lasing without inversion and proposed a closed four-level atomic model for the lasing without inversion.
研究了频率随时间变化的压缩态光场与二能级原子的相互作用，主要讨论了光场频率随时间作正弦调制和脉冲调制两种典型情况下原子布居数反转随时间的演化特性。
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated.
研究了频率随时间变化的压缩态光场与二能级原子的相互作用，主要讨论了光场频率随时间作正弦调制和脉冲调制两种典型情况下原子布居数反转随时间的演化特性。
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated.
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