中文摘要：

正交模分裂（或真空Rabi分裂）是原子与光学腔构成的复合系统实现强相互作用的一个典型现象。本文理论研究了三能级原子介质与腔构成的复合系统，利用线性色散理论将腔内三能级原子自感应透明（EIT）介质的吸收和色散引入光学腔透射公式，非常直观清晰得到腔透射谱的三个分裂峰，它是由腔内EIT介质的吸收和色散特性使一个共振腔模分裂为三个腔模。该方法可以推广到腔内含有任意色散和吸收的介质。

英文摘要：

The normal-mode splitting （or the vacuum Rabi splitting） is a typical strong interaction of atoms in the cavity QED system. Linear-dispersion theory was adopted to research a composite atom-cavity system. By putting absorption and dispersion of intracavity three-energy level atom in the EIT condition （ EIT medium） into the formula of the empty-cavity transmission, we can see that a resonance transmission spectrum was split into three transmission spectrums due to absorption and dispersion of EIT medium in the cavity. The method can be applied to all cavities which contain medium of random absorption and dispersion.