基于3^(3)Σ_(1)^(+)共振耦合态制备超冷基态85Rb133Cs分子的实验研究  

Experimental Investigations on Preparation of Ultracold RbCs Molecules in the Ground State Based on Resonant Coupling 3Σ state

作　　者：宫廷 姬中华[1,2] 李中豪 杜佳琪[1,2] 赵延霆 肖连团 贾锁堂[1,2] GONG Ting;JI Zhong-hua;LI Zhong-hao;DU Jia-qi;ZHAO Yan-ting;XIAO Lian-tuan;JIA Suo-tang(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,太原030006 [2]山西大学极端光学协同创新中心,太原030006

出　　处：《量子光学学报》2021年第1期62-69,共8页Journal of Quantum Optics

基　　金：国家重点研发计划(2017YFA0304203);国家自然科学基金(61675120;61875110;12074231;12034012);优秀研究团队国家自然科学基金项目(61121064);山西省“1331工程”重点学科建设计划;教育部长江学者和创新团队发展计划(IRT 17R70);111计划(D18001)。

摘　　要：本文3^(3)Σ_(1)^(+)以为中间激发态,通过扫描光缔合光的频率得到了3^(3)Σ_(1)^(+)的不同振动态光谱。研究发现利用短程光缔合制备的超冷基态85Rb133Cs分子产率在3^(3)Σ_(1)^(+)(v=3)处较其他振动态更大,3^(3)Σ_(1)^(+)(v=3)转动常数较邻近的振动态有明显变化且与23Π0-(v=14)的能量接近,这些特征显示了这两个振动态的共振耦合特性。优化光缔合光的功率和光电离光的能量后,我们得到X1Σ+(v=0)最低振动态超冷85Rb133Cs分子的产率为1.5×10^(4)/s。在考虑了分子波函数的宇称和跃迁选择定则后,我们发现3^(3)Σ_(1)^(+)(v=3,J=1)存在单步自发辐射制备超冷基态85Rb133Cs分子的通道,采用该通道可实现原子-分子相干转移直接制备超冷基态分子。In this paper, we choose 3^(3)Σ_(1)^(+) as an intermediate state and obtain relevant vibrational spectra by scanning the frequency of PA laser. It is found that the production rate of ultracold85Rb133 Cs molecules in the lowest vibrational state,formed by short-range PA, is larger in 3^(3)Σ_(1)^(+)(v = 3) than other vibrational states, the corresponding rotational constant in3^(3)Σ_(1)^(+)(v = 3) is abrupt and the energy is close to 23Π0-(v = 14) state. All of these display the characteristic of resonant coupling between these two states. After the optimization of PA laser intensity and photoionization power, the production rate of85Rb133 Cs molecules in X1Σ+(v = 0) is measured to be around 1.5 × 104/s. With the consideration of the parity of the molecular wave function and the selection rules, we find that 3^(3)Σ_(1)^(+)(v = 3, J = 1) intermediate state has the passway that can spontaneously decay to ground state of ultracold85Rb133 Cs molecules via single pass which is meaningful to explore on direct transfer from atom to molecule using stimulated Raman adiabatic passage.

关 键 词：共振耦合 单步自发辐射 光缔合 光电离 

分 类 号：O431[机械工程—光学工程]