摘要
为了制备适于原子干涉仪实验的低温锂原子样品,开展了锂原子的塞曼减速及与磁光阱囚禁相关的实验研究.设计并实现了一种结构紧凑的腔体内冷式多级线圈叠加的塞曼减速器,将速度小于600 m/s的7Li原子减速到60 m/s,磁光阱装载速率为5×108/s,囚禁原子数目1×109个,原子团的最低温度约为220±30μK.研究了光学黏胶中7Li原子的寿命与囚禁光频率失谐量的关系.这些结果为进一步开展7Li原子亚多普勒冷却、光势阱蒸发冷却以及原子干涉仪实验奠定了基础.
To prepare cold lithium atoms for atomic interferometry experiments, we have carried out experimental researches on Zeeman deceleration and magneto-optical trap （MOT） of lithium atoms. We have also designed and implemented a compact adjustable Zeeman slower with an inner water cooling chamber, to decelerate the velocity of the rLi atom beam from 600 m/s down to 60 m/s, and load them into the MOT. The loading rate is 5 ×10^8/s, the total trapped atom number is 1 ×10^9, and the lowest temperature of the atom cloud is 220 ± 30 μK. Then we investigate the dependence of lifetime of 7Li atoms in optical molasses on the detuning of trapping laser beams. The above results lay a foundation for further sub-Doppler cooling, optical trap based on evaporative cooling, and atomic interferometry experiments.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第15期99-105,共7页
Acta Physica Sinica
基金
国家重点基础研究发展规划(批准号:2010CB832805)
国家自然科学基金(批准号:11074281
11227803)资助的课题~~
关键词
激光冷却与囚禁
塞曼减速器
磁光阱
原子干涉仪
laser cooling and trapping； Zeeman slower； magneto-optical trap； atom interferometer
