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Experimental Observation of Autler-Townes Splitting of Li2
SongMin,Yi Peng,Liu Yaoming,Li Li
Author NameAffiliationE-mail
SongMin Department ofPhysics andKeyLab ofAtomic andMolecularNanosciences, Tsinghua University, Beijing100084  
Yi Peng Department ofPhysics andKeyLab ofAtomic andMolecularNanosciences, Tsinghua University, Beijing100084  
Liu Yaoming Department ofPhysics andKeyLab ofAtomic andMolecularNanosciences, Tsinghua University, Beijing100084  
Li Li Department ofPhysics andKeyLab ofAtomic andMolecularNanosciences, Tsinghua University, Beijing100084 lili@mail.tsinghua.edu.cn 
Abstract:
Autler-Townes (A-T) splitting of the A1Σ+ustate of7Li2has been experimentally studied by pulsed optical-optical double resonance (OODR) spectroscopy. A stronger coupling field (the pump laser) excited an A1Σ+uv′, J′←X1Σ+gv″, J″transition and induced the A-Tsplitting of the A1Σ+uv′, J′and X1Σ+gv″, J″levels, while a detecting laser (the probe laser) detected theA-Tsplittingofthe intermediateA1Σ+uv′, J′level bythe further excitingtothe 41Σ+gstate and monitored the collision-induced violet fluorescence fromthe upper 41Σ+glevel. When the coupling laser frequency was tuned off resonance, the excitation signals displayed doublet splittingwhichwas proportional to the frequency detuning of the coupling laser under the experimental conditions. The dependence of relative intensities of the two lines on coupling and detecting laser intensities and buffer gas pressure was studied.
Key words:  Li2, Autler-Townes splitting, ac Stark effect, A1Σ+ustate of Li2, OODR
FundProject:
Li2 Autler-Townes分裂的实验观察
宋敏,易鹏,刘耀明,李丽*
摘要:
用光学-光学双共振激光光谱研究了 7Li2A 1Σ+u态的Autler-Townes (A-T) 分裂.一个强的耦合场 (泵浦激光)激发 7Li2A 1Σ+u v′, J′← X 1Σ+g v″, J″跃迁,诱发A 1Σ+u v′, J′能级和 X 1Σ+gv″, J″能级的A-T分裂.另一个探测激光从A 1Σ+u v′,J′能级进一步激发到4 1Σ+g态.扫描探测激光,监测4 1Σ+g态碰撞诱导紫色荧光,从而探测A 1Σ+u v′, J′能级的A-T分裂.当耦合场频率偏离共振时,激发光谱线出现双重分裂.在该实验条件下,分裂大小和泵浦激光频率偏离共振频率的失谐量成正比. 研究了A-T分裂的两条线的相对强度与泵浦、探测光的强度及缓冲气体压力的关系.
关键词:  Li2  Autler-Townes分裂  ac Stark效应  Li2 A 1Σ+u 态  OODR
DOI:10.1088/1674-0068/16/5/357-362
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