Wang Gang, Cen Lin, Qu Yi, Xue Yan, Wu Jin-Hui, Gao Jin-Yue
College of Physics, Jilin University, Changchun 130012, China.
Opt Express. 2011 Oct 24;19(22):21614-9. doi: 10.1364/OE.19.021614.
We extend the study on a four-wave mixing (FWM) scheme of contiuous-wave lasers in a hot rubidium vapor when the probe and coupling fields work in the electromagnetically induced transparency (EIT) regime while the pump and signal fields work in the two-photon Raman regime. Our experimental results show that the generated signal field is well contained in an EIT dip of the incident probe field as a result of efficient FWM. We find, in particular, that an optimal FWM process can only be attained when the coupling and pump fields are well matched in intensity. If the probe intensity is far beyond the EIT condition, however, the nonlinear efficiency of energy transfer from the probe field to the signal field will be greatly reduced.
我们扩展了对连续波激光在热铷蒸汽中的四波混频（FWM）方案的研究，此时探测场和耦合场工作在电磁诱导透明（EIT） regime，而泵浦场和信号场工作在双光子拉曼 regime。我们的实验结果表明，由于高效的FWM，产生的信号场很好地包含在入射探测场的EIT凹陷中。我们特别发现，只有当耦合场和泵浦场在强度上良好匹配时，才能实现最佳的FWM过程。然而，如果探测强度远远超出EIT条件，从探测场到信号场的能量转移的非线性效率将大大降低。
