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。

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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。

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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。

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