Development of an ultracold bright atomic beam and its application to atom interferometer

超冷亮原子束的研制及其在原子干涉仪中的应用

• 批准号: 12440110
• 负责人: KATORI Hidetoshi
• 金额: $ 9.73万
• 依托单位: the University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440110/
• 关键词: Laser cooling; Population transfer; Metastable state; Blackbody radiation; Optical pumping; OPO; Mid-infrared transition; ラマントランスファー; 四重極磁場トラップ; 周波数標準; レーザー冷却・トラッピング; 半導体レーザー; 第2次高調波発生

After constructing the main experimental equipment (lasers, vacuum chambers) in H12, we have performed laser cooling experiments in H13. We have examined the spectroscopic properties of the strontium metastable state, which is the main topic of our research. After that, we have experimentally investigated the generation of an ultracold continuous scalar atomic wave using population transfer between metastable states. The results are as follows :1. Evaluation of the generation efficiency of the 5s5p ^3P_2 metastable state by using the pumping process in the magneto-optical trap (MOT)(5s^2 ^1S_0-5s5p ^1P_1). We measured the rate to be 5xl0^9 s^<-1>.2. We have measured the lifetime of the 5s5p ^3P_2 metastable state to be 500s. We found the dominant decay channel of the state to be the population transfer induced by room-temperature blackbody radiation.3. Formation of the metastable MOT (5s5p ^3P_2-5s5d ^3D_3) and continuous generation of the 5s5p ^3P_0 atomic beam using optical pumping. This scheme has the advantage that we can completely separate the states used for cooling and that used for further experiment.4. Development of a mid-infrared (MIR) light source for generating a nK atomic wave. We obtained the MIR light by optical parametric oscillation in a PPLN crystal pumped by a stable high-power laser diode. By using the MIR transition (5s5p ^3P_2-5s4d ^3D_3), the attained temperature will be 1/25 of that attained with the visible light, since the recoil temperature, which determines the cooling limit, is inversely proportional to square of the wavelength of the cooling transition

继H12主要实验设备（激光器、真空室）搭建完成后，我们又在H13进行了激光冷却实验。我们研究了锶亚稳态的光谱​​特性，这是我们研究的主要课题。之后，我们通过实验研究了利用亚稳态之间的粒子迁移产生超冷连续标量原子波。结果如下： 1．利用磁光陷阱（MOT）中的泵浦过程评估5s5p ^3P_2亚稳态的产生效率（5s^2 ^1S_0-5s5p ^1P_1）。我们测得速率为 5xl0^9 s^<-1>.2。我们测得 5s5p ^3P_2 亚稳态的寿命为 500 秒。我们发现该态的主要衰变通道是室温黑体辐射引起的布居转移。 3．形成亚稳态 MOT (5s5p ^3P_2-5s5d ^3D_3) 并使用光泵浦连续生成 5s5p ^3P_0 原子束。该方案的优点是可以完全分离用于冷却的状态和用于进一步实验的状态。 4．开发用于产生 nK 原子波的中红外 (MIR) 光源。我们通过稳定的高功率激光二极管泵浦的 PPLN 晶体中的光学参量振荡获得了中红外光。通过使用 MIR 跃迁 (5s5p ^3P_2-5s4d ^3D_3)，所达到的温度将是可见光所达到的温度的 1/25，因为决定冷却极限的反冲温度与冷却跃迁波长的平方成反比

项目成果

Hidetoshi Katori: "Spectroscopy of strontium atoms in the Lamb-Dicke confinement"Proceedings of the 6th Symposium Frequency Standards and Metrology, edited by P. Gill, World Scientific, New Jersey. 323-330 (2002)

Hidetoshi Katori：“Lamb-Dicke 禁闭中锶原子的光谱学”第六届频率标准和计量研讨会论文集，由 P. Gill 编辑，新泽西州 World Scientific。

Hidetoshi Katori: "Spectroscopy of strontium atoms in the Lamb-Dicke confinement"Proceeding of the 6^<th> symposium on frequency standards and metrology, World Scientific. 2002.

Hidetoshi Katori：“兰姆-迪克禁闭中锶原子的光谱”第六届频率标准和计量学研讨会论文集，世界科学。

Hidetoshi Katori: "Spectroscopy of strontium atoms in the Lamb-Dicke confinement"Proceedings of the 6th Symposium Frequency Standardards and Metrology, World Scientific. 323-330 (2002)

Hidetoshi Katori：“Lamb-Dicke 禁闭中锶原子的光谱”第六届频率标准与计量研讨会论文集，世界科学。