Li Y Q, Xiao M
Opt Lett. 1996 Jul 15;21(14):1064-6. doi: 10.1364/ol.21.001064.
We report an experimental observation of the enhancement of nondegenerate four-wave mixing (NDFWM) based on electromagnetically induced transparency (EIT) in a lambda-type three-level system of rubidium atoms. We measured both the linear susceptibility Im chi(D)((1)) (absorption) and the third-order nonlinear coefficient chi(D)((3)) separately for the NDFWM process at a low atomic density. We found that, owing to the EIT effect, the linear absorption term Im chi(D)((1)) is greatly reduced, while the nonlinear generation term chi(D)((3)) is resonantly enhanced, permitting us to observe a significant enhancement of the NDFWM signal in an optically dense medium.
我们报告了基于铷原子λ型三能级系统中电磁诱导透明（EIT）的非简并四波混频（NDFWM）增强的实验观测结果。我们分别测量了低原子密度下NDFWM过程的线性极化率Im χ(D)(1)（吸收）和三阶非线性系数χ(D)(3)。我们发现，由于EIT效应，线性吸收项Im χ(D)(1)大大降低，而非线性产生项χ(D)(3)共振增强，这使我们能够在光学致密介质中观测到NDFWM信号的显著增强。
