本文采取旋波近似，分析了序列脉冲激光作用下的双能级系统。
Two-level systems under the action of a laser pulse train are studied by rotating-wave approximation.
两能级原子与外部环境(热库)相互作用时，采用非旋波近似，研究原子与热辐射场单光子和双光子作用过程。
The interaction of a two-level atom with a thermal radiation field for single-photon processes and two-photon processes without rotating wave approximation is analysed.
用双曲函数法，成功得到了非线性浅水长波近似方程组的精确孤立波解。
We successfully derived some exact solitary wave solutions of the nonlinear approximate equations with long waves in shallow water by using the hyperbola function method.
采用相对论扭曲波近似方法对高离化态类铜铅离子的自电离速率系数与双电子俘获强度进行了计算。
Autoionization rates and dielectronic capture strengths of two other high-Z elements Au and Ta for comparison are also calculated.
特别是对于TM波，考虑了非线性折射率的双轴性，没有任何近似。
In particular, for the TM case, the biaxial nature of nonlinear refractive index is considered without any approximation.
采用常微分方程理论研究了无旋波近似下双光子J-C模型系统的时间演化。
The time evolution of system in two photon Jaynes Cummings (J C) model without rotating waves approximation (RWA) is obtained by using the theory of ordinary differential equations.
在平面波近似下，给出了双调Q激光运转的耦合方程组，数值求解方程组得到的理论值与实验结果相符。
The coupled rate equations under the plane-wave approximation are used to simulate the Q-switched process of the laser, and the numerical solutions accord well with the experimental results.
在平面波近似下，给出了双调Q激光运转的耦合方程组，数值求解方程组得到的理论值与实验结果相符。
The coupled rate equations under the plane-wave approximation are used to simulate the Q-switched process of the laser, and the numerical solutions accord well with the experimental results.
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