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
Abstract We report a highly efficient three-dimensional degenerated Raman sideband cooling (3D dRSC) that enhances the loading of a magnetically levitated optical dipole trap, and observe the strong atom loss due to the three-body recombination. The 3D dRSC is implemented to obtain 5×107 Cs atoms with the temperature of ～ 480 nK. The cold temperature enables 1.8×107 atoms loaded into a crossed dipole trap with an optimized excessive levitation magnetic gradient. Compared to the loading of atoms from a bare magneto-optical trap or the gray-molasses cooling, there is a significant increase in the number of atoms loaded into the optical dipole trap. We derive for the three-body recombination coefficient of L3 = 7.73×10-25 cm6/s by analyzing the strong atom loss at a large scattering length of 1418 Bohr radius, and discover the transition from the strong three-body loss to the dominant one-body loss. Our result indicates that the lifetime of atoms in the optical dipole trap is finally decided by the one-body loss after the initial strong three-body loss.
Fund: Project funded by the National Key Research and Development Program of China (Grant No. 2022YFA1404201), the National Natural Science Foundation of China (Grant Nos. 62020106014, 92165106, 62175140, 12074234, and 11974331), and the Applied Basic Research Project of Shanxi Province, China (Grant No. 202203021224001).
Yuqing Li(李玉清), Zhennan Liu(刘震南), Yunfei Wang(王云飞), Jizhou Wu(武寄洲), Wenliang Liu(刘文良), Yongming Fu(付永明), Peng Li(李鹏), Jie Ma(马杰), Liantuan Xiao(肖连团), and Suotang Jia(贾锁堂) High efficient Raman sideband cooling and strong three-body recombination of atoms 2023 Chin. Phys. B 32 103701
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