一种测量磁光阱中冷原子密度和温度的新方法  

A New Method for Measuring Density and Temperature of Cold Atoms in Magneto-Optical Trap

作　　者：付军贤[1] 李义民[1] 陈徐宗[1] 杨东海[1] 王义遒[1] 

机构地区：[1]北京大学电子学系,北京100871

出　　处：《光学学报》2001年第4期414-416,共3页Acta Optica Sinica

基　　金：国家自然科学基金! (970 40 0 1);教育部高等学校博士点专项科研基金

摘　　要：报道了对磁光阱中冷铯原子吸收谱的实验观察 ,由于冷原子的多普勒增宽远小于激发态超精细分裂 ,实验观察到三个孤立的吸收峰 (Cs ,6S1/2 ,F =4→ 6P3/2 ,F =3 ,4,5 ) ,其吸收系数比为 3∶7∶12 ,这与相应跃迁振子强度一致。利用吸收信号测量了冷原子云的密度 ,结果与荧光探测法在 10 %的精度内符合 ;用吸收信号测量了冷原子的温度 ,测量结果与用荧光飞行时间法和释放捕捉法的结果吻合。The experimental observation of the absorption spectrum of cold atoms in magneto-optical trap (MOT) was reported. Because the Doppler broadening of cold atoms in MOT is far less than the hyperfine structure splitting, three abosrption peaks (Cs,6S 1/2 ,F=4→6P 3/2 ,F=3,4,5) with a ratio of absorption coefficient of 3∶7∶12 were observed. The density of cold atoms was also measured by using absorption signal and the result agreed with fluorescence detecting method within 10% tolerance. The temperature of cold atoms measured using absorption method agreed well with that by fluorescence TOF method and release and recapture method.

关 键 词：磁光阱 吸收谱 冷原子 密度 温度 飞行时间谱 吸收信号 量子光学 

分 类 号：O562.3[理学—原子与分子物理] O431.2[理学—物理]