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.
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.
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.
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