采用时间演化算符方法,研究腔内单模光场中Λ-型三能级单原子的辐射谱,给出了辐射谱一般公式,并讨论在粒子数纯态、相干态和热辐射三种光场激励下的辐射频谱结构。

By means of time-evolution operator, the emission spectrum of a Λ-type three-level atom interacted with a single-mode cavity field was studied. The physical spectrum expression of radiation emitted by the atom is given. The spectrum shows the symmetrical six-peak structure. We have discussed the structure of the emission spectrum for the input in pure number state, a coherent input and a thermal input.