Then, we extend the method to the calculation of resonance fluorescence spectrum with two-photon transition. The results exhibit characteristics different from the one-photon transition.
然后，推广这种方法到双光子跃迁的共振荧光谱计算，获得了与单光子跃迁不同的结果。
The results show that the Doppler background due to the near resonance of the intermediate level is eliminated and the signal of two-photon transition can be distinguished from saturation absorption.
计算结果表明它能有效地克服中间能级近共振所产生的多普勒背景，并有效地区分单光子饱和吸收讯号和双光子跃迁讯号。
Meanwhile, the maximum two-photon transition probability is obtained by choosing the best shaping function under the resonance case.
近共振时，选择最佳相位函数对脉冲整形，可获得最大的双光子跃迁几率。
First, We set up the two-photon Planck radiation equation, then give a new definition of Einsient probability coefficients, calculate the two-photon transition probability and analyze the results.
给出爱因斯坦几率系数的新定义；进而计算了双光子自发跃迁几率，并对结果作了分析讨论。
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated.
研究了频率随时间变化的压缩态光场与二能级原子的相互作用，主要讨论了光场频率随时间作正弦调制和脉冲调制两种典型情况下原子布居数反转随时间的演化特性。
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated.
研究了频率随时间变化的压缩态光场与二能级原子的相互作用，主要讨论了光场频率随时间作正弦调制和脉冲调制两种典型情况下原子布居数反转随时间的演化特性。
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