Precise measurement of the line width of the photoassociation spectra of ultracold molecules by using a frequency shifter

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 m...

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Published inChinese physics B Vol. 21; no. 9; pp. 224 - 228
Main Author 武寄洲 马杰 姬中华 张一驰 李玉清 汪丽蓉 赵延霆 肖连团 贾锁堂
Format Journal Article
LanguageEnglish
Published 01.09.2012
Subjects
Cesium
Excitation spectra
Extrapolation
Frequency shifters
Laser beams
Lasers
Separation
Spectral lines
分子光谱
宽度
激光光束
激光强度
移频器
精确测量
缔合
超冷分子
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Summary: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 （34.8± 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.
Bibliography:laser cooling, molecular spectroscopy, line shapes and width
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 （34.8± 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.
Wu Ji-Zhou, Ma Jie, Ji Zhong-Hua , Zhang Yi-Chi, Li Yu-Qing , Wang Li-Rong , Zhao Yan-Ting, Xiao Lian-Tuan, and Jia Suo-Wang State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/9/093701