中国物理B ›› 2000, Vol. 9 ›› Issue (5): 342-350.doi: 10.1088/1009-1963/9/5/006

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PYRAMIDAL-HOLLOW-BEAM DIPOLE TRAP FOR ALKALI ATOMS

王义遒1, 朱一夫2, 高伟建3, 王育竹4, 印建平5   

  1. (1)Department of Electronics, Peking University, Beijing 100871, China; (2)Department of Physics, Florida International University, Miami, Florida 33199, USA; (3)Department of Physics, Suzhou University, Suzhou 215006, China; (4)Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; (5)Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Department of Physics, Suzhou University, Suzhou 215006, China
  • 收稿日期:1999-04-04 出版日期:2000-05-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 69878019 and 19834060), the Ministry of Science and Technology of China (Grant No. 95-yu-34), and the Natural Science Foundation of Jiangsu Province, China (Grant No. DK9713

PYRAMIDAL-HOLLOW-BEAM DIPOLE TRAP FOR ALKALI ATOMS

Yin Jian-ping (印建平)ab, Gao Wei-jian (高伟建)b, Wang Yu-zhu (王育竹)a, Zhu Yi-fu (朱一夫)c, Wang Yi-qiu (王义遒)d   

  1. a Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;  b Department of Physics, Suzhou University, Suzhou 215006, China;  c Department of Physics, Florida International University, Miami, Florida 33199, USA;  d Department of Electronics, Peking University, Beijing 100871, China
  • Received:1999-04-04 Online:2000-05-15 Published:2005-06-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 69878019 and 19834060), the Ministry of Science and Technology of China (Grant No. 95-yu-34), and the Natural Science Foundation of Jiangsu Province, China (Grant No. DK9713

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摘要： We propose a dark gravito-optical dipole trap, for alkali atoms, consisting of a blue-detuned, pyramidal-hollow laser beam propagating upward and the gravity field. When cold atoms from a magneto-optical trap are loaded into the pyramidal-hollow beam and bounce inside the pyramidal-hollow beam, they experience efficient Sisyphus cooling and geometric cooling induced by the pyramidal-hollow beam and the weak repumping beam propagating downward. Our study shows that an ultracold and dense atomic sample with an equilibrium 3D momentum of ～3 \hbar k and an atomic density above the point of Bose-Einstein condensation may be obtained in this pure optical trap.

Abstract: We propose a dark gravito-optical dipole trap, for alkali atoms, consisting of a blue-detuned, pyramidal-hollow laser beam propagating upward and the gravity field. When cold atoms from a magneto-optical trap are loaded into the pyramidal-hollow beam and bounce inside the pyramidal-hollow beam, they experience efficient Sisyphus cooling and geometric cooling induced by the pyramidal-hollow beam and the weak repumping beam propagating downward. Our study shows that an ultracold and dense atomic sample with an equilibrium 3D momentum of ～3 $\hbar$ $k$ and an atomic density above the point of Bose-Einstein condensation may be obtained in this pure optical trap.

中图分类号:  (Zeeman and Stark effects)

  • 32.60.+i
37.10.De (Atom cooling methods) 42.50.-p (Quantum optics)