Precise measurement of the line width of the photoassociation spectra of ultracold molecules by a frequency shifter |
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| Authors: | Wu Ji-Zhou Ma Jie Ji Zhong-Hua Zhang Yi-Chi Li Yu-Qing Wang Li-Rong Zhao Yan-Ting Xiao Lian-Tuan Jia Suo-Tang |
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| Affiliation: | 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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| Keywords: | laser cooling molecular spectroscopy line shapes and width |
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