电磁引起透明：强信号、反对称失谐情形

ELECTROMAGNETICALLY-INDUCED TRANSPARENCY: STRONG SIGNAL AND ANTI-SYMMETRICAL DETUNING CASE

在强信号场与产生相干的外场分别与Λ原子两个偶极允许跃迁具有反对称失谐情况下严格求解了原子密度矩阵方程，在等拉比频率（Ｇ）条件下发现失谐很小时存在近似的相干粒子俘陷现象，这导致介质对强信号光的Ｏ（Ｇ￣（－３））级透明。当先谐量为Ｇ／２时，原子近似等概率地处于三个能级，透明仅具有Ｏ（Ｇ￣（－１））量级。

The equations of atomic density matrix are solved without any approximationwhen the strong signal field and external coherence-driving field are detuned torespect ive dipole-allowed transition of theΛatom in such a way that △_1=-△_2Under the equal Rabi frequency(G)condition,it is found that approximate. coherentpopulation trapping appears for small detuning, which leads to the transparency ofthe medium to the strong signal having an order of O(G).If the detuning is G/2,the atom nearly equally populates three levels and the transparency is of only orderO(G￣(-1)).