Precision spectroscopy with a single 40Ca＋ ion in a Paul trap
Precision spectroscopy with a single 40Ca＋ ion in a Paul trap
复制标题
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
管桦;黄垚;刘培亮;边武;邵虎;高克林
中科院分区：
文献类型：
--
作者：
管桦;黄垚;刘培亮;边武;邵虎;高克林
报道了在729 nm波长下对40 Ca+离子4s 2S 1/2- 3d 2D 5/2时钟跃迁的精密测量。在环形Paul阱中捕获并激光冷却了单个~（40）Ca ~+离子，离子储存时间超过一个月。729 nm激光器通过连续锁定超腔一个月以上，线宽减小到1Hz左右，时钟跃迁的总系统不确定度优于6.5×10-16。利用以氢脉泽为基准的光频梳在10-15级测量时钟跃迁的绝对频率，氢脉泽通过全球定位系统（GPS）校准到SI秒。频率值为411 042 129776 393.0（1.6）Hz，并对系统偏移进行了校正。为了进行两个~（40）Ca ~+光频标的比较，我们又构造了一个类似的~（40）Ca ~+光频标。两个光频标的稳定度为1×10-14τ-1/2，平均时间为3天。此外，两个额外的精密测量的基础上，单一的捕获40 Ca+离子进行。一个是3d ~ 2D ~（5/2）态寿命测量，我们的结果为1174（10）ms，与文献[Phys.Rev.A62032503（2000）]和[Phys.Rev.A71032504（2005）]中的结果一致。另一个是4s 2S 1/2- 3d 2D 5/2时钟跃迁的魔波长;| M J| =1/2= 395.7992（7）nm和λ| M J| =3/2=395.7990（7）nm，首次报道了40 Ca ~+钟跃迁的两个魔波长。
Precision measurement of the 4s2S1/2–3d2D5/2clock transition based on40Ca+ion at 729 nm is reported. A single40Ca+ion is trapped and laser-cooled in a ring Paul trap, and the storage time for the ion is more than one month. The linewidth of a 729 nm laser is reduced to about 1 Hz by locking to a super cavity for longer than one month uninterruptedly.The overall systematic uncertainty of the clock transition is evaluated to be better than 6.5×10-16. The absolute frequency of the clock transition is measured at the 10-15 level by using an optical frequency comb referenced to a hydrogen maser which is calibrated to the SI second through the global positioning system(GPS). The frequency value is 411 042 129776 393.0(1.6) Hz with the correction of the systematic shifts. In order to carry out the comparison of two40Ca+optical frequency standards, another similar40Ca+optical frequency standard is constructed. Two optical frequency standards exhibit stabilities of 1×10-14τ-1/2with 3 days of averaging. Moreover, two additional precision measurements based on the single trapped40Ca+ion are carried out. One is the 3d2D5/2state lifetime measurement, and our result of 1174(10) ms agrees well with the results reported in [Phys. Rev. A 62 032503(2000)] and [Phys. Rev. A 71 032504(2005)]. The other one is magic wavelengths for the 4s2S1/2–3d2D5/2clock transition; λ|m j|=1/2= 395.7992(7) nm and λ|m j|=3/2=395.7990(7) nm are reported, and it is the first time that two magic wavelengths for the40Ca+clock-transition have been reported.