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arXiv 1402.5271physics.atom-ph
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基于永磁体的锶塞曼减速器

Zeeman Slowers for Strontium based on Permanent Magnets

Ian R. Hill, Yuri B. Ovchinnikov, Elizabeth M. Bridge, E. Anne Curtis, Patrick Gill

摘要:

我们提出的设计,构造和表征的纵向和横向场塞曼慢,基于阵列的永磁体,用于减缓原子Sr的热束。慢优化与减速相关的本地激光强度(由参数$ε$),更有效地使用可用的激光功率,在通常的恒定减速模式的操作。实现了高达$\approx$ $18$ $%$的减速效率,并与通过建模预测的减速效率进行了比较。我们强调的横向场慢,这是紧凑的,高度可调,重量轻,不需要电力,作为一个简单的解决方案,以减缓锶,非常适合于星载应用。对于$^{88}$ Sr,我们实现了大约$6\times 10^9$原子$\,$ s $^{-1}$在$30$ ms $^{-1}$的慢原子通量,将大约$5\times 10^8$原子加载到磁光阱(MOT)中,并以近似的相对自然丰度捕获所有同位素。

英文摘要:

We present the design, construction, and characterisation of longitudinal- and transverse-field Zeeman slowers, based on arrays of permanent magnets, for slowing thermal beams of atomic Sr. The slowers are optimised for operation with deceleration related to the local laser intensity (by the parameter $ε$), which uses more effectively the available laser power, in contrast to the usual constant deceleration mode. Slowing efficiencies of up to $\approx$ $18$ $%$ are realised and compared to those predicted by modelling. We highlight the transverse-field slower, which is compact, highly tunable, light-weight, and requires no electrical power, as a simple solution to slowing Sr, well-suited to spaceborne application. For $^{88}$Sr we achieve a slow-atom flux of around $6\times 10^9$ atoms$\,$s$^{-1}$ at $30$ ms$^{-1}$, loading approximately $5\times 10^8$ atoms in to a magneto-optical-trap (MOT), and capture all isotopes in approximate relative natural abundances.

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