论文标题
同时为thulium光学时钟准备两个初始时钟状态
Simultaneous two initial clock states preparation for thulium optical clock
论文作者
论文摘要
由于Thulium光学时钟对黑体辐射的灵敏度低以及准确性和稳定性估计，因此它似乎是最有前途的可运输光钟之一。 TM时钟过渡的主要系统效应之一，即二阶Zeeman效应，可以通过在时钟操作期间探测不同高精细的地面和亚稳态状态之间的两个时钟过渡来取消。我们以$ m_f = 0 $同时准备两个地面超精细水平的状态，并互相激发两个时钟过渡。在这里，我们通过单频辐射在418.8 nm处证明了有效的光学泵送到两个目标状态。 $ M_F = 0 $的地面超精细水平的状态为非零磁性甲级磁甲基的初始原子数量的36％和3.8％，相应地相应地。我们对光学泵送过程进行了数值模拟，该模拟能够很好地解释实验结果。
Due to the low sensitivity of the thulium optical clock to black-body radiation and good accuracy and stability estimations, it appears to be one of the most promising transportable optical clocks. One of the leading systematic effects for Tm clock transition, namely the second-order Zeeman effect, can be canceled by probing two clock transitions between different hyperfine levels of ground and metastable states during the clock operation. We prepare the atoms in $m_F=0$ state of both ground hyperfine levels simultaneously and excite alternately two clock transitions. Here we demonstrate efficient optical pumping into both target states via single-frequency radiation at 418.8 nm. The resulting population of $m_F=0$ states of ground hyperfine levels is 36% and 3.8% of the initial number of atoms with less than 4% and 0.4% on non-zero magnetic sublevels, correspondingly. We performed numerical simulations of the optical pumping process which is able to explain experimental results reasonably well.
