The necessary population inversion can be achieved in a variety of ways .
我们可以用各种方法来实现这种必要的粒子数反转。
Chemical laser is characteristically energized by an exoergic chemical reaction which produces the necessary population inversion of lasing species.
化学激光器是以释能化学反应提供能源，并且以化学反应产生粒子数反转为基础的。
With the increase of the average photon number of the coherent light field, the oscillation frequency of the atomic population inversion increases correspondingly.
随相干光场平均光子数的增加粒子数反转的振荡频率增大；
Microwave emission lines with anomalous intensity ratio would be produced when the relativistic electrons move through a, molecular cloud with a certain population inversion.
相对论电子在某种粒子数反转布居的分子云中穿行时，可以产生具有反常强度比的微波发射谱线。
When the squeezing coefficient of the initial field increases, the frequency of collapse-revival in atomic population inversion increases, and the amplitude of revival decreases.
研究结果表明，初始光场的压缩系数增大，崩塌和回复的频率增大，回复值减小。
Using rate equation theory, the equation group including the population inversion density of the gain medium, photon density and the absorber ground state population density is acquired.
利用速率方程理论，得到包含激光增益介质反转密度、光子密度和饱和吸收介质基态布居数密度的速率方程组。
It should be noted that the atomic coupling coefficient exhibits the nonlinear effect and the entanglement measure oscillates periodically in accordance with atomic population inversion.
值得一提的是可得出原子间耦合作用强度对纠缠量的非线性效应，并且纠缠量展现出与原子反转粒子数一致的周期振荡现象。
It should be noted that the atomic coupling coefficient exhibits the nonlinear effect and the entanglement measure oscillates periodically in accordance with atomic population inversion.
值得一提的是可得出原子间耦合作用强度对纠缠量的非线性效应，并且纠缠量展现出与原子反转粒子数一致的周期振荡现象。
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