单光子和双光子电磁诱导透明谱的相干调制

采用一束相干外场作用在倒Y模型原子的基态与另外状态构成的跃迁上，实现对单光子和双光子电磁诱导透明谱的调制。经研究发现相干外场对单光子和双光子的吸收性质有类似的影响效果。由于相干外场的作用，吸收谱的共振点附近出现吸收峰将原单重透明谱分裂为双重透明谱。诱导的吸收峰的高度和透明谱的频谱宽度与相干外场的强度有密切关系。并用缀饰态理论解释了这些物理现象。这些研究对多通道光通信以及对原子光学性质的调控方面有积极意义。

Coherent modulation of single and two-photon electromagnetically induced transparency spectra

The single and two-photon electromagnetically induced transparency can be modulated by using a coherent field to drive the transition connected by the ground level of the coupling transition in a inverted-Y scheme atomic system and another level. The coherent field influences the single and two-photon absorption properties in the similar way. There appears one absorption peak induced by the coherent field and this peak splits the single transparency window into two parts. The height of the peak and the frequency width of the transparency spectra are closely dependent on the strength of the coherent field. These phenomena are explained by using the dressed-state. This can be useful in multi-channel optical communication and controllable manipulation of the atomic optical properties.