Laser cooling of a magnetically guided ultracold atom beam
Laser cooling of a magnetically guided ultracold atom beam
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DOI：
10.1088/1367-2630/12/6/065018
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发表时间：
2010-02
影响因子：
3.3
通讯作者：
A. Aghajani-Talesh;M. Falkenau;V. Volchkov;L. Trafford;T. Pfau;A. Griesmaier
中科院分区：
文献类型：
--
作者：
A. Aghajani-Talesh;M. Falkenau;V. Volchkov;L. Trafford;T. Pfau;A. Griesmaier
本文报道了超冷铬原子束的磁导引横向激光冷却。通过引导件的渐缩的径向压缩被用于热传导地加热梁。在锥形部分内，通过垂直于它的二维（2D）光学糖蜜从原子束中提取热量，导致原子相空间密度的显着增加。施加磁偏移场以防止光泵浦到未捕获状态。我们的结果表明，通过适当选择磁偏置场，可以避免冷却束强度和失谐，原子损失和纵向加热。最终温度低于65 μK，对应于被引导光束中相空间密度增加30倍以上。
We report on the transverse laser cooling of a magnetically guided beam of ultracold chromium atoms. Radial compression by a tapering of the guide is employed to adiabatically heat the beam. Inside the tapered section, heat is extracted from the atom beam by a two-dimensional (2D) optical molasses perpendicular to it, resulting in a significant increase in atomic phase space density. A magnetic offset field is applied to prevent optical pumping to untrapped states. Our results demonstrate that, by a suitable choice of the magnetic offset field, the cooling beam intensity and detuning, atom losses and longitudinal heating can be avoided. Final temperatures below 65 μK have been achieved, corresponding to an increase in phase space density in the guided beam by more than a factor of 30.