Enhanced optical molasses cooling for Cs atoms with largely detuned cooling lasers  

作　　者：Di Zhang Yu-Qing Li Yun-Fei Wang Yong-Ming Fu Peng Li Wen-Liang Liu Ji-Zhou Wu Jie Ma Lian-Tuan Xiao Suo-Tang Jia 张迪;李玉清;王云飞;付永明;李鹏;刘文良;武寄洲;马杰;肖连团;贾锁堂(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,College of Physics and Electronics Engineering,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,College of Physics and Electronics Engineering,Shanxi University,Taiyuan 030006,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Physics B》2020年第2期249-253,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2017YFA0304203);the National Natural Science Foundation of China(Grant Nos.61722507,61675121,and 61705123);PCSIRT(Grant No.IRT17R70);the 111 Project(Grant No.D18001);the Shanxi 1331 KSC,the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi(OIT),the Applied Basic Research Project of Shanxi Province,China(Grant No.201701D221002);the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province;the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics.

摘　　要：We report a detailed study of the enhanced optical molasses cooling of Cs atoms,whose large hyperfine structure allows to use the largely red-detuned cooling lasers.We find that the combination of a large frequency detuning of about-110 MHz for the cooling laser and a suitable control for the powers of the cooling and repumping lasers allows to reach a cold temperature of^5.5μK.We obtain 5.1×10^7 atoms with the number density around 1×10^12 cm^-3.Our result gains a lower temperature than that got in other experiments,in which the cold Cs atoms with the temperature of^10μK have been achieved by the optical molasses cooling.We report a detailed study of the enhanced optical molasses cooling of Cs atoms,whose large hyperfine structure allows to use the largely red-detuned cooling lasers.We find that the combination of a large frequency detuning of about-110 MHz for the cooling laser and a suitable control for the powers of the cooling and repumping lasers allows to reach a cold temperature of～5.5 μK.We obtain 5.1×107 atoms with the number density around 1×1012 cm-3.Our result gains a lower temperature than that got in other experiments,in which the cold Cs atoms with the temperature of～10 μK have been achieved by the optical molasses cooling.

关 键 词：optical MOLASSES frequency DETUNING MAGNETO-OPTICAL TRAP laser COOLING 

分 类 号：TN249[电子电信—物理电子学] O562[理学—原子与分子物理]