物理学报2024，Vol.73Issue(11)：103-109,7.DOI:10.7498/aps.73.20240182
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 by Λ-enhanced gray-molasses cooling process
摘要
Abstract
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 line Λ-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 fieldτ(Bx,By,Bz),single-photon detuning ∆,two-photon detuning,δ ratio of cooling beam power to repumping beam power Icool/Irep,and cooling beam power Icooling.The optimal parameters in this system are follows:τ=7 ms,δ=0.2 MHz,∆=5Γ,Icool/Irep=3,and Icool=1.2Isat.Comparing with traditional PGC-assisted loading,the number of atoms is increased about 4 times,and the atomic temperature decreases from 25 μK to 8 μK.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Key words
Λ-enhanced gray molasses cooling/Doppler temperature limit/wide-range frequency tuning/cold atom引用本文复制引用
刘岩鑫,王志辉,管世军,王勤霞,张鹏飞,李刚,张天才..光学阱中Λ增强型灰色黏团冷却辅助原子装载[J].物理学报,2024,73(11):103-109,7.基金项目
国家自然科学基金(批准号:U21A6006,U21A20433,11974223,11974225,12104277,12104278)和山西省"1331 工程"重点学科建设基金资助的课题. Project supported by the National Natural Science Foundation of China(Grant Nos.U21A6006,U21A20433,11974223,11974225,12104277,12104278)and the Fund for"1331 Project"Key Subjects Construction of Shanxi Province,China. （批准号:U21A6006,U21A20433,11974223,11974225,12104277,12104278）
