Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
Phys Rev Lett. 2011 May 13;106(19):193006. doi: 10.1103/PhysRevLett.106.193006. Epub 2011 May 11.
We report on the first experimental demonstration of low-light-level cross-phase modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.
我们报告了第一个基于冷铯原子中双电磁感应透明（EIT）的低光水平交叉相位调制（XPM）的实验演示，使用两个慢光脉冲。双 EIT 是通过两个控制场和两个弱场来实现的，弱场驱动两个双自旋极化态中准备的粒子。通过调整控制场中的一个场的强度，可以实现群速度匹配。XPM 基于由两套 EIT 形成的非对称 M 型五能级系统。通过群速度匹配观察到 XPM 的增强。我们的工作推进了基于双慢光脉冲的低光水平非线性光学的研究。
