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1)  threshold population inversion density
临界粒子数反转密度
2)  critical inversion desity
临界反转密度
3)  threshold population
临界粒子数
4)  population inversion
反转粒子数
1.
In this paper we start from the rate equations describing a Q switched laser system with a saturable absorber and finally deduce the condition of this kind of Q switching which should be satisfied by the laser crystal population inversion.
本文从描述饱和吸收体调Q的速率方程出发,推导实现有激发态吸收的饱和吸收体调Q所需的反转粒子数理论上应满足的条件,并对其进行讨论与分析。
2.
The condition of this kind of Q-switching which should be satisfied by the laser crystal population inversion is deduced.
从描述饱和吸收体调Q的速率方程出发,推导出了实现有激发态吸收的饱和吸收体调Q所需的反转粒子数理论上应满足的条件,并对其进行了讨论与分析,与参考文献的相关叙述相符。
3.
The extraction efficiency and the distribution of population inversion in multi pass amplifier are calculated theoretically.
理论上计算了在多程放大过程中反转粒子数的利用效率、反转粒子数的分布等。
5)  population inversion
粒子数反转
1.
Based on boltzmann distribution law,thermodynamic scale of temperature is discussed of three level laser working matter system in negative temperature state,realized population inversion.
从玻耳兹曼发布律出发,对处于负温度状态(即实现粒子数反转)的三能级激光工作物质系统的热力学温度进行了讨论,指出在负温度状态下,粒子系统的热力学温度仍可以大于零,证明了负温度状态并不等同于热力学温度T<0的状态。
2.
94 μm, but only changes the relation between the population inversion of  4I 13/2  and  4I 15/2  levels and the concentration of Er 3+ ions.
66μm波长激光粒子数反转,即N2(4I13/2)>N1(4I15/2)与Er3+离子浓度的关系。
3.
The evolution properties of the field entropy and the population inversion in an interacting system of a coherent superposition state and a two-level atom are studied and compared with that of the coherent superposition state formed by the coherent state and vacuum state.
研究了压缩相干态和真空态构成的相干叠加态光场与二能级原子相互作用系统中场熵的演化特性及粒子数反转效应,并与相干态和真空态构成的相干叠加态光场的场熵特性及粒子数反转效应进行了比较。
6)  particle number density
粒子数密度
补充资料:布居数反转
分子式:
CAS号:

性质: 又称粒子数反转或布居倒转。在一系统中发生原子能级的再分布,以致产生激光作用。正常情况下,一组原子处于温度平衡体系之中时,处于低能态的原子总是多于高能态的。但是能量的吸收与发射是一种连续过程,不同能态原子的统计分布(布居)保持不变。当抽运能量使这系统受到激励时,分布受到扰动,会出现粒子数反转:高能态的原子数(亦即布居数)比低能态的多。

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