When the phase of Rabi frequency is changed, gain and absorption for the probe field occur, EIT phenomenon also exists, but the phase change cannot influence the population in the high level alone.

• 而拉比频率相位的变化则会导致系统对探测光既有吸收也有增益,并且也呈现电磁感应透明现象,但仅仅相位的变化并不影响高能级的粒子数分布。