| Diffracted field distribution from a knife-edge truncated semi-Gaussian beam as an atomic （molecular） mirror |
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| 引用本文： | 郑萍,高伟建,印建平. Diffracted field distribution from a knife-edge truncated semi-Gaussian beam as an atomic （molecular） mirror[J]. 中国物理, 2006, 15(1): 116-125. DOI: 10.1088/1009-1963/15/1/019 |
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| 作者姓名： | 郑萍 高伟建 印建平 |
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| 作者单位： | (1)Department of Physics, Suzhou University, Suzhou 215006, China; (2)Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Ministry of Education, Department of Physics, East China Normal University, Shanghai 200062, China; (3)Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Ministry of Education, Department of Physics, East China Normal University, Shanghai 200062, China;Department of Physics, Suzhou University, Suzhou 215006, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant Nos 10174050 and 10374029),the Key Program of National Natural Science Foundation of China (Grant No 10434060), and by the Shanghai Priority Academic Discipline and the 211 Foundation of the Ministry of Education of China. |
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| 摘 要： | We investigate the diffraction characteristics of an incident Gaussianbeam cutby a straight edge bounding a semi-infinite opaque plane using Kirchhoffscalar wave theory in the Fresnel limit, and propose a new and simple mirrorscheme to reflect atoms by using the intensity gradient induced by ablue-detuned semi-Gaussian laser beam. The optical potential of thediffracted light of the knife-cut semi-Gaussian beam for$^{85}$Rb atom and its spontaneous emission probability are calculated andcompared with the performance of the evanescent-wave mirror. Our study showsthat the optical potential of the diffracted light of the semi-Gaussian beamis far higher than that of the evanescent light wave, and the maximum normalvelocity of the incident atoms can be far greater than that of theevanescent light wave under the same parameters, so the blue-detunedsemi-Gaussian beam, as a novel atomic mirror, can be used to efficientlyreflect cold atoms with a normal velocity of greater than 1 m/s. However,the intensity gradient (force) of the diffracted light of thesemi-Gaussian-beam is much smaller than that of the evanescent light wave, soits spontaneous emission probability is greater than that from theevanescent-wave when the normal velocity of incident atoms is greater.
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| 关 键 词： | 衍射域分布 半高斯束 原子镜 原子束反射 Fresnel极限 |
| 收稿时间： | 2005-04-04 |
| 修稿时间： | 2005-04-042005-07-11 |
Diffracted field distribution from a knife-edge truncated semi-Gaussian beam as an atomic (molecular) mirror |
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| Zheng Ping,Gao Wei-Jian and Yin Jian-Ping. Diffracted field distribution from a knife-edge truncated semi-Gaussian beam as an atomic (molecular) mirror[J]. Chinese Physics, 2006, 15(1): 116-125. DOI: 10.1088/1009-1963/15/1/019 |
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| Authors: | Zheng Ping Gao Wei-Jian Yin Jian-Ping |
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| Affiliation: | Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Ministry of Education, Department of Physics, East China Normal University, Shanghai 200062, China; Department of Physics, Suzhou University, Suzhou 215006, China |
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| Abstract: | We investigate the diffraction characteristics of an incident Gaussianbeam cutby a straight edge bounding a semi-infinite opaque plane using Kirchhoffscalar wave theory in the Fresnel limit, and propose a new and simple mirrorscheme to reflect atoms by using the intensity gradient induced by ablue-detuned semi-Gaussian laser beam. The optical potential of thediffracted light of the knife-cut semi-Gaussian beam for$^{85}$Rb atom and its spontaneous emission probability are calculated andcompared with the performance of the evanescent-wave mirror. Our study showsthat the optical potential of the diffracted light of the semi-Gaussian beamis far higher than that of the evanescent light wave, and the maximum normalvelocity of the incident atoms can be far greater than that of theevanescent light wave under the same parameters, so the blue-detunedsemi-Gaussian beam, as a novel atomic mirror, can be used to efficientlyreflect cold atoms with a normal velocity of greater than 1 m/s. However,the intensity gradient (force) of the diffracted light of thesemi-Gaussian-beam is much smaller than that of the evanescent light wave, soits spontaneous emission probability is greater than that from theevanescent-wave when the normal velocity of incident atoms is greater. |
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| Keywords: | semi-Gaussian beam reflection of atomic beam atomic mirror |
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