Department of Physics, Zhejiang University, Hangzhou, 310027, China.
College of Physics and Electronic Engineering, Shanxi University, Taiyuan, 030006, China.
Sci Rep. 2017 Jul 19;7(1):5796. doi: 10.1038/s41598-017-06266-0.
We experimentally demonstrate coherent amplification of probe field in a tripod-type atoms driven by strong coupling, signal and weak probe fields. We suppress linear and nonlinear atomic absorptions for resonant and near resonant probe via double electromagnetically induced transparency (DEIT). Combining these advantages of suppressed absorption along with temperature- or atomic-density-controlled transfer of population(ToP) between hyperfine ground states, we can induce near-resonant amplification of probe through stimulated Raman scattering(SRS) pumped by low-intensity signal field. The increased population difference of initial and final states of SRS due to increased ToP rate, together with reduced absorption at the second EIT window in an optically thick Cesium vapor, gives rise to highly effective coherent amplification.
我们通过强耦合、信号和弱探测场驱动的三脚架型原子实验演示了探测场的相干放大。我们通过双电磁感应透明（DEIT）抑制了共振和近共振探测的线性和非线性原子吸收。结合抑制吸收的这些优点以及超精细基态之间温度或原子密度控制的布居转移（ToP），我们可以通过低强度信号场泵浦的受激拉曼散射（SRS）诱导近共振探测的放大。由于 ToP 速率的增加，SRS 的初始和最终状态的布居差增加，以及在光学厚铯蒸气中的第二个 EIT 窗口的吸收减少，导致了高效的相干放大。
