Generations of dark hollow beams and their applications in laser cooling of atoms and all optical-type Bose－Einstein condensation
Yin Jian-Ping (印建平)ab, Gao Wei-Jian (高伟建)b, Wang Hai-Feng (王海峰)c, Long Quan (龙全)c, Wang Yu-Zhu (王育竹)c
a Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China; b Department of Physics, Suzhou University, Suzhou 215006, China; c Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Science, Shanghai 201800, China
Abstract We report on a new experimental result to generate dark hollow beams by using a geometric optical method. We propose two new methods to produce focused and localized hollow laser beams by using $\pi$-phase plates. Using Monte-Carlo simulations, we have studied the Sisyphus cooling of alkali atoms in pyramidal hollow beam gravito-optical traps. We discuss some potential applications of the dark hollow beams in atom optics and the preparation of an all optically-cooled and optically-trapped atomic Bose－Einstein condensation (BEC). Our research shows that an ultracold atomic sample with a temperature of ～ 2μK can be obtained in the pyramidal hollow beam dipole trap and an all optical-type BEC may be realized in a far blue-detuned, hollow beam trap.
Received: 10 January 2002
Revised: 24 June 2002
Accepted manuscript online:
(Mechanical effects of light on atoms, molecules, and ions)
Fund: Project supported by the Natural Science Foundation of Jiangsu Province (Grant Nos DK97139 and 00KJB140001) and the National Natural Science Foundation of China (Grant Nos 69878019, 19834060 and 19834060) and the Ministry of Science and Technology of Chin
Cite this article:
Yin Jian-Ping (印建平), Gao Wei-Jian (高伟建), Wang Hai-Feng (王海峰), Long Quan (龙全), Wang Yu-Zhu (王育竹) Generations of dark hollow beams and their applications in laser cooling of atoms and all optical-type Bose－Einstein condensation 2002 Chinese Physics 11 1157
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