Precise measurement of the line width of the photoassociation spectra of ultracold molecules by using a frequency shifter
Precise measurement of the line width of the photoassociation spectra of ultracold molecules by using a frequency shifter
复制标题
DOI：
10.1088/1674-1056/21/9/093701
复制
发表时间：
2012-09
影响因子：
1.7
通讯作者：
Jizhou Wu;Jie Ma;Zhonghua Ji;Yichi Zhang;Yuqing Li;Lirong Wang;Yanting Zhao;Liantuan Xiao;Suotang Jia
中科院分区：
文献类型：
--
作者：
Jizhou Wu;Jie Ma;Zhonghua Ji;Yichi Zhang;Yuqing Li;Lirong Wang;Yanting Zhao;Liantuan Xiao;Suotang Jia
我们提出了一种精确测量激发态铯分子的光缔合光谱线宽的方法，该方法利用移频器产生两束具有精确频率差的激光。用两条激光诱导的分子谱线记录了一系列光缔合（PA）光谱，其峰间距可作为测量PA光谱线宽的精确频率标尺。研究了半峰全宽与PA激光强度的关系。在零激光强度的外推值为（34.84？0.22）MHz。通过分析其他增宽机制，（32.02？0.70）MHz。结果表明，该方案是廉价的，简单的，鲁棒性，并在各种其他原子物种的应用是有前途的。
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 (PA) spectra are recorded with two laser beam induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the 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.