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A Novel Gravito-Optical Surface Trap for Neutral Atoms |
| XIE Chun-Xia;WANG Zhengling;YIN Jian-Ping |
| Key Laboratory of Optical and Magnetic Resonance Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062 |
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| Cite this article: |
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XIE Chun-Xia, WANG Zhengling, YIN Jian-Ping 2006 Chin. Phys. Lett. 23 822-825 |
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Abstract We propose a novel gravito-optical surface trap (GOST) for neutral atoms based on one-dimensional intensity gradient cooling. The surface optical trap is composed of a blue-detuned reduced semi-Gaussian laser beam (SGB), a far-blue-detuned dark hollow beam and the gravity field. The SGB is produced by the diffraction of a collimated Gaussian laser beam passing through the straight edge of a semi-infinite opaque plate and then is reduced by an imaging lens. We calculate the intensity distribution of the reduced SGB, and study the dynamic process of the SGB intensity-gradient induced Sisyphus cooling for 87Rb atoms by using Monte Carlo simulations. Our study shows that the proposed GOST can be used not only to trap cold atoms loaded from a standard magneto-optical trap, but also to cool the trapped atoms to an equilibrium temperature of 3.47μK from ～120μK, even to realize an all-optical two-dimensional Bose--Einstein condensation by using optical-potential evaporative cooling.
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| Keywords:
32.80.Pj
32.80.Lg
42.50.Vk
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Published: 01 April 2006
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