PYRAMIDAL-HOLLOW-BEAM DIPOLE TRAP FOR ALKALI ATOMS |
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Authors: | Yin Jian-ping Gao Wei-jian Wang Yu-zhu Zhu Yi-fu and Wang Yi-qiu |
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Institution: | Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Department of Physics, Suzhou University, Suzhou 215006, China; Department of Physics, Florida International University, Miami, Florida 33199, USA; Department of Electronics, Peking University, Beijing 100871, China |
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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. |
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