Subrecoil cooling of ^(6)Li atoms by 2S→3P ultraviolet narrow transition  

作　　者：Yang Rui Liang Zhang Rui Li Pengyue Liu Xuemei Liu Chunyang Duan Shichuan Yu Yuelong Wu Haibin Wu 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,Institute of Quantum Science and Precision Measurement,East China Normal University,Shanghai 200062,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [3]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第8期36-41,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11925401,12234008,and 12074125);the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01)。

摘　　要：Laser cooling of atoms and molecules is crucial to exhibiting excellent features in the field of low-temperature physics.Cooling ^(6)Li atoms to very low temperatures is difficult due to their partially resolved D_(2) line of excited states.Here we report an observation of cooling ^(6)Li atom samples to 16μK with an ultraviolet(UV)laser in a magneto-optical trap,which breaks the Doppler cooling limit and approaches half of the photon-recoil limit.The essential mechanism of cooling results is that the natural linewidth is comparable to the recoil frequency in such a 2S→3P ultraviolet narrow transition.Laser frequency stability is important in the cooling process,and thus,the UV laser was locked to an optical frequency comb referenced to an ultrastable optical cavity.The cooling was numerically simulated to explain the cooling forces.The results can provide an ideal platform in the field of precision measurements and ultracold Fermi gases.

关 键 词：cold atom narrow-line UV cooling photon-recoil limit 

分 类 号：O562[理学—原子与分子物理]