The first three terms of the perturbation are obtained, which can be used for two or three photon resonant processes.
计算到三阶微扰项，其结果可用于双光子及三光子共振过程。
Photophysical processes of the chlorophyll derivative photosensitizer CPD3 were investigated under two-photon excitation (TPE) induced by a femtosecond pulse laser.
用飞秒脉冲激光，研究了二氢卟吩光敏剂CPD3分子在双光子激发(TPE)下的光物理过程。
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.
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 nonlinear spectroscopy created by many kind of optical processes are observed while two-photon resonance enhanced the atomic nonlinear susceptibility.
双光子共振增强了碱金属原子的非线性极化率，可以观测到多种非线性光学过程产生的非线性光谱。
Our results show that the laser gain comes from two basic processes, i. e., a two-photon process and a two-step process.
本文的结果表明，激光增益来源于两个基本过程：两个光子过程和两步过程。
Our results show that the laser gain comes from two basic processes, i. e., a two-photon process and a two-step process.
本文的结果表明，激光增益来源于两个基本过程：两个光子过程和两步过程。
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