Observation of V-type electromagnetically induced transparency and optical switch in cold Cs atoms by using nanofiber optical lattice

Optical nanofiber (ONF) is a special tool to achieve the interaction between light and matter with ultralow power. In this paper, we demonstrate V-type electromagnetically induced transparency (EIT) in cold atoms trapped by an ONF-based two-color optical lattice. At an optical depth of 7.35, 90% transmission can be achieved by only 7.7 pW coupling power. The EIT peak and linewidth are investigated as a function of the coupling optical power. By modulating the pW-level control beam of the ONF-EIT system in sequence, we further achieve efficient and high contrast control of the probe transmission, as well as its potential application in the field of quantum communication and quantum information science by using one-dimensional atomic chains.     

超冷85Rb133Cs分子转动态碰撞特性研究

使用损耗光谱技术测量了直接光缔合制备的X¹?⁺(v=0)振动基态超冷⁸⁵Rb¹³³Cs分子的转动态分布,使用微波脉冲技术操控了超冷⁸⁵Rb¹³³Cs分子转动态布居转化,对基态超冷⁸⁵Rb¹³³Cs分子最低振动态上纯转动态和混合转动态的碰撞特性进行了研究。具体地测量了⁸⁵Rb¹³³Cs分子分别处于X¹?⁺(v=0, J=1)转动态、X¹?⁺(v=0, J=2)转动态以及这两个转动态形成的混合态这三种情况下的分子布居演化,引入速率方程来描述损耗过程中分子的动力学过程并获得分子非弹性碰撞系数,实验发现转动混合态的碰撞系数高于纯转动态碰撞系数,造成这种差异的原因主要来自于相邻转动态之间的偶极—偶极相互作用。本工作为理解超冷极性分子非弹性碰撞机制、制备低温高密度超冷极性分子提供了重要参考。