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Precise measurement of the line width of the photoassociation spectra of ultracold molecules by a frequency shifter |
| Wu Ji-Zhou (武寄洲), Ma Jie (马杰), Ji Zhong-Hua (姬中华), Zhang Yi-Chi (张一驰), Li Yu-Qing (李玉清), Wang Li-Rong (汪丽蓉), Zhao Yan-Ting (赵延霆), Xiao Lian-Tuan (肖连团), Jia Suo-Tang (贾锁堂) |
| State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China |
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Abstract We propose a technique to precisely measure the line width of the photoassociation spectra of the excited cesium molecule by using a frequency shifter to generate two laser beams with a precise frequency difference. A series of photoassociation spectra are recorded with two laser beams induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the photoassociation (PA) spectra. The full width half maximum line width was studied as a function of PA laser intensity. The extrapolated value at zero laser intensity is (34.84 ± 0.22) MHz. By analyzing other broadening mechanisms, a value of (32.02 ± 0.70) MHz was deduced. It is shown that this scheme is inexpensive, simple, robust, and is promising for applications in a variety of other atomic species.
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Received: 06 February 2012
Revised: 14 March 2012
Accepted manuscript online:
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PACS:
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37.10.De
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(Atom cooling methods)
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32.70.Jz
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(Line shapes, widths, and shifts)
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33.70.-w
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(Intensities and shapes of molecular spectral lines and bands)
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB921603), the National High Technology Research and Development of China (Grant No. 2009AA01Z319), the National Natural Science Foundation of China (Grant Nos. 61008012, 10934004, 60978018, 60978001, 60808009, and 11074154), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 60821004), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20101401120004), and the National Natural Science Foundation of Shanxi Province, China (Grant No. 2009011059-2). |
Corresponding Authors:
Ma Jie
E-mail: mj@sxu.edu.cn
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Cite this article:
Wu Ji-Zhou (武寄洲), Ma Jie (马杰), Ji Zhong-Hua (姬中华), Zhang Yi-Chi (张一驰), Li Yu-Qing (李玉清), Wang Li-Rong (汪丽蓉), Zhao Yan-Ting (赵延霆), Xiao Lian-Tuan (肖连团), Jia Suo-Tang (贾锁堂) Precise measurement of the line width of the photoassociation spectra of ultracold molecules by a frequency shifter 2012 Chin. Phys. B 21 093701
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