论文标题
光学晶格的亚稳态斜纹的中红外磁磁陷阱
A mid-infrared magneto-optical trap of metastable strontium for an optical lattice clock
论文作者
论文摘要
我们报告了在能量水平之间在2.92 $ $ $ m m之间运行的亚稳态延伸的磁光陷阱（MOT）$ 5S5P〜^3 \ MATHRM {P} _2 $和$ 5S4D〜^3 \ MATHRM {d} _3 $。最初，在能量水平$ 5S^2〜^1 \ Mathrm {s} _0 $和$ 5S5P〜^1 \ Mathrm {P} _1 $之间的461 nm过渡之间捕获了跨原子，然后将其转移到稳定的MOT中，并冷却到最终温度6 $ k。通过使用相同的金字塔反射器来实现这两个MOT，可以减轻对齐中红外和461 nm光的挑战。最后，2.92 $μ$ m的过渡用于实现光学晶格时钟的完整冷却顺序，其中$^{87} \ mathrm {sr {sr} $的冷样品被加载到魔术波长的光学晶格中，并以旋转状态初始化，以允许高级光学范围$ 5S $ 5S^2^2 〜s^2 〜sa $ 5S5P〜^3 \ MATHRM {P} _0 $时钟过渡。
We report on the realization of a magneto-optical trap (MOT) for metastable strontium operating on the 2.92 $μ$m transition between the energy levels $5s5p~^3\mathrm{P}_2$ and $5s4d~^3\mathrm{D}_3$. The strontium atoms are initially captured in a MOT operating on the 461 nm transition between the energy levels $5s^2~^1\mathrm{S}_0$ and $5s5p~^1\mathrm{P}_1$, prior to being transferred into the metastable MOT and cooled to a final temperature of 6 $μ$K. Challenges arising from aligning the mid-infrared and 461 nm light are mitigated by employing the same pyramid reflector to realize both MOTs. Finally, the 2.92 $μ$m transition is used to realize a full cooling sequence for an optical lattice clock, in which cold samples of $^{87}\mathrm{Sr}$ are loaded into a magic-wavelength optical lattice and initialized in a spin-polarized state to allow high-precision spectroscopy of the $5s^2~^1\mathrm{S}_0$ to $5s5p~^3\mathrm{P}_0$ clock transition.
