利用三维光晶格技术实现铯原子冷却的实验研究

发布时间：2018-06-04 04:29

本文选题：原子冷却 + 光晶格　；参考：《中国科学:物理学力学天文学》2017年06期

【摘要】：激光冷却原子是超冷原子分子物理实验的基础,在精密测量、量子模拟等研究中具有重要的意义.为了获得温度更低,密度更高的超冷铯原子样品作为制备超冷基态铯分子的起点,本文实验展示了一种利用三维光晶格装载实现超冷铯原子温度进一步降低的方法,有效克服了磁光阱中超冷原子辐射光子自吸收引起的加热问题.在标准的磁光阱系统中获得超冷铯原子的基础上,利用压缩磁光阱技术提高超冷铯原子的密度.通过四束激光构建三维光晶格,实现超冷铯原子的高效装载,采用飞行时间法测量了原子的温度,观察到温度由~6 0.0μK降低至~1 1.6μK的冷却结果.同时研究了光晶格激光的频率与原子装载数目的关系,发现在负失谐1 5.5GHz时光晶格装载效率最高.同时,本文研究了利用光晶格减小超冷原子辐射光子自吸收引起的加热问题,对于进一步降低铯原子温度的研究具有深远的意义.
[Abstract]:Laser cooling of atoms is the basis of ultracold atomic and molecular physics experiments, which is of great significance in the research of precision measurement and quantum simulation. In order to obtain lower temperature and higher density samples of ultra-cooled cesium atoms as the starting point for preparing ultra-cold ground state cesium molecules, a method of further lowering the temperature of ultra-cooled cesium atoms by using three-dimensional optical lattice loading has been demonstrated in this paper. It effectively overcomes the heating problem caused by photon self-absorption caused by ultra-cold atomic radiation in magneto-optical trap. On the basis of obtaining supercooled cesium atoms in a standard magneto-optical trap system, the density of supercooled cesium atoms is improved by using compressed magneto-optical trap technique. Three-dimensional optical lattice was constructed by four beams of laser to realize the high efficiency loading of cesium atoms. The temperature of the atoms was measured by time-of-flight method. The cooling results were observed when the temperature was reduced from 60.0 渭 K to 11.6 渭 K. At the same time, the relationship between the frequency of optical lattice laser and the number of atom loading is studied. It is found that the lattice loading efficiency is the highest in negative detuning 1 5.5GHz. At the same time, the heating problem caused by using optical lattice to reduce the radiation photon self-absorption of supercooled atoms is studied, which is of great significance to further reduce the temperature of cesium atoms.
【作者单位】：山西大学物理电子工程学院激光光谱研究所量子光学与光量子器件国家重点实验室;晋城职业技术学院机械电子工程系;山西大学极端光学协同创新中心;
【基金】：国家重点基础研究发展计划(编号:2012CB921603) 教育部长江学者和创新团队发展计划(编号:IRT13076) 国家自然科学基金重大研究计划培育项目(编号:91436108);国家自然科学基金(编号:61378014,61308023,61378015,11434007) 教育部新教师基金(编号:20131401120012)资助
【分类号】：O562

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