Ba原子6s^2 ~1S-0-6s6p^3P_1跃迁Hanle效应实验研究  

Hanle effect of 6s^2 ~1S_0-6s6p^3P_1 transition of barium atom

作　　者：余庚华[1,2,3] 仲嘉琪[1,2,3] 王谨[1,2] 詹明生[1,2] 

机构地区：[1]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,湖北武汉430071 [2]中国科学院原子频标重点实验室,湖北武汉430071 [3]中国科学院研究生院,北京100049

出　　处：《量子电子学报》2012年第3期257-264,共8页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金项目(10827404);国家基础研究发展规划课题(2005CB724501)

摘　　要：Ba原子是光频标的候选者之一,对其进行有效的激光冷却与囚禁需要相关能级的寿命和跃迁几率的信息。Ba原子激发态6s6p^3P_1能级在激光冷却实验中很重要,通过Hanle效应实验测量了这一能级的寿命和自发辐射率,从理论和实验上研究了探测激光有限线宽和光强对Ba原子基态6s^2 ~1S_0与激发态6s6p^3P_1之间跃迁(波长791 nm)Hanle效应荧光信号的影响。在考虑了激光线宽和光强因素后所得到的激发态6s6p3P1的能级寿命和自发辐射率与其他方法给出的结果符合很好。Barium atom is one of candidates for optical atomic clock. Laser cooling and trapping the atom need sufficient spectroscopic information of relevant energy levels. The excited energy level 6s6p3p1 is very important in the experiment of laser cooling and trapping barium atoms. Hanle effect was examined both theoretically and experimentally for the 6s2 ~ So to 6s6p 3P1 transition at 791 nm. A theoretical model was developed to include the influence of linewidth and intensity of probe laser on the fluorescence of Hanle effect. By fitting the experimental measurement with the model, lifetime and transition probabilities of 6s6p 3P1 state to lower states were obtained and found to be in good agreement with other reports.

关 键 词：光谱学 能级寿命 Hanle效应 线宽 BA原子 原子频标 

分 类 号：O434.13[机械工程—光学工程] O562.3[理学—光学]