| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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A crossed focused vortex beam with application to cold molecules |
| Meng Xia(夏梦)1, Yaling Yin(尹亚玲)1,†, Chunying Pei(裴春莹)1, Yuer Ye(叶玉儿)1, Ruoxi Gu(顾若溪)1, Kang Yan(严康)1, Di Wu(吴迪)1, Yong Xia(夏勇)1,2,3, and Jianping Yin(印建平)1,‡ |
1 State Key Laboratory of Precision Apectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;
3 NYU-ECNU Institute of Physics at NYU Shanghai, Shanghai 200062, China |
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Abstract We report the generation of a crossed, focused, optical vortex beam by using a pair of hybrid holograms, which combine the vortex phase and lens phase onto a spatial light modulator. We study the intensity distributions of the vortex beam in free propagation space, and the relationship of its dark spot size with the incident Gaussian beam's waist, the lens's focal length, and its orbital angular momentum. Our results show that the crossed, focused, vortex beam's dark spot size can be as small as 16.3μm and adjustable by the quantum number of the orbital angular momentum, and can be used to increase the density of trapped molecules. Furthermore, we calculate the optical potential of the blue-detuned, crossed vortex beam for MgF molecules. It is applicable to cool and trap neutral molecules by intensity-gradient-induced Sisyphus cooling, as the intensity gradient of such vortex beam is extremely high near the focal point.
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Received: 17 March 2021
Revised: 14 April 2021
Accepted manuscript online: 19 April 2021
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PACS:
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42.40.Jv
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(Computer-generated holograms)
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37.10.Mn
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(Slowing and cooling of molecules)
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87.80.Cc
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(Optical trapping)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11834003 and 91836103). |
Corresponding Authors:
Yaling Yin, Jianping Yin
E-mail: ylyin@phy.ecnu.edu.cn;jpyin@phy.ecnu.edu.cn
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Cite this article:
Meng Xia(夏梦), Yaling Yin(尹亚玲), Chunying Pei(裴春莹), Yuer Ye(叶玉儿), Ruoxi Gu(顾若溪), Kang Yan(严康), Di Wu(吴迪), Yong Xia(夏勇), and Jianping Yin(印建平) A crossed focused vortex beam with application to cold molecules 2021 Chin. Phys. B 30 114202
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