光学阱中Λ增强型灰色黏团冷却辅助原子装载  

Atoms loading and cooling for an optical cavity assisted byΛ-enhanced gray-molasses cooling process

作　　者：刘岩鑫 王志辉[1,2] 管世军 王勤霞 张鹏飞[1,2] 李刚[1,2] 张天才[1,2] Liu Yan-Xin;Wang Zhi-Hui;Guan Shi-Jun;Wang Qin-Xia;Zhang Peng-Fei;Li Gang;Zhang Tian-Cai(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006 [2]山西大学,极端光学省部共建协同创新中心,太原030006

出　　处：《物理学报》2024年第11期126-132,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:U21A6006,U21A20433,11974223,11974225,12104277,12104278);山西省“1331工程”重点学科建设基金资助的课题。

摘　　要：Λ增强型灰色黏团冷却技术(Λgray molasses cooling,Λ-GMC)已被广泛用于制备低于亚多普勒温度极限的冷原子样品实验中.本文设计搭建了宽范围、快速调谐的激光系统,其调谐范围最高可达600 MHz.基于该激光系统,于光学微腔中心通过铯原子D2线Λ-GMC冷却辅助腰斑大小为15μm的交叉偶极阱中原子的装载,相比于传统的偏振梯度冷却辅助装载,原子数增加了约4倍,原子温度由25μK降低至8μK.该实验对超冷原子样品实验制备和单原子阵列俘获等研究具有重要借鉴意义.Λ-enhanced gray molasses cooling(Λ-GMC)technique has been widely used in experiments to prepare cold atomic samples below the sub-Doppler temperature limit.To meet the experimental requirements of cavity quantum electrodynamics systems,we design and construct a wide-range,fast-tuning laser system by integrating tapered amplifiers,fiber phase modulators,etalon,injection locking amplification techniques etc.This laser system achieves a maximum tuning range of 600 MHz and a frequency tuning speed of 5 ns.Based on this laser system,loading atom in a crossed dipole trap assisted by cesium D2 lineΛ-GMC cooling in the center of the optical microcavity is studied,and various factors affecting the atom loading are mainly as follows:laser duration τ,three-dimensional magnetic field,single-photon detuning,two-photon detuning,ratio of cooling beam power to repumping beam power,and cooling beam power.The optimal parameters in this system are follows:Comparing with traditional PGC-assisted loading,the number of atoms is increased about 4 times,and the atomic temperature decreases from to.This experiment provides important insights for preparing ultracold atomic samples and capturing single atom arrays.

关 键 词：Λ-GMC冷却 多普勒温度极限 宽范围频率调谐 冷原子 

分 类 号：G63[文化科学—教育学]