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Chin. Phys. B, 2014, Vol. 23(11): 113702    DOI: 10.1088/1674-1056/23/11/113702
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Systematically investigating the polarization gradient cooling in an optical molasses of ultracold cesium atoms

Ji Zhong-Hua, Yuan Jin-Peng, Zhao Yan-Ting, Chang Xue-Fang, Xiao Lian-Tuan, Jia Suo-Tang
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Abstract  We systematically investigate the polarization gradient cooling (PGC) process in an optical molasses of ultracold cesium atoms. The SR mode for changing the cooling laser, which means that the cooling laser frequency is stepped to the setting value while its intensity is ramped, is found to be the best for the PGC, compared with other modes studied. We verify that the heating effect of the cold atoms, which appears when the cooling laser intensity is lower than the saturation intensity, arises from insufficient polarization gradient cooling. Finally, an exponential decay function with a statistical explanation is introduced to explain the dependence of the cold atom temperature on the PGC interaction time.
Keywords:  ultracold atoms      optical molasses      polarization gradient cooling  
Received:  12 March 2014      Revised:  11 May 2014      Published:  15 November 2014
PACS:  37.10.De (Atom cooling methods)  
  67.85.-d (Ultracold gases, trapped gases)  
  37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)  
Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921603 and 2010CB923103), the International Science & Technology Cooperation Program of China (Grant No. 2011DFA12490), the National Natural Science Foundation of China (Grant Nos. 11304189, 61378015, and 61275209), the Project for Excellent Research Team of the National Natural Science Foundation of China (Grant No. 61121064), the Program for Changjiang Scholars, China, and the Innovative Research Team in University, China (Grant No. IRT13076).
Corresponding Authors:  Zhao Yan-Ting     E-mail:  zhaoyt@sxu.edu.cn

Cite this article: 

Ji Zhong-Hua, Yuan Jin-Peng, Zhao Yan-Ting, Chang Xue-Fang, Xiao Lian-Tuan, Jia Suo-Tang Systematically investigating the polarization gradient cooling in an optical molasses of ultracold cesium atoms 2014 Chin. Phys. B 23 113702

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