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arXiv 0802.0857physics.atom-phquant-ph
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强磁性原子的窄线磁光冷却与囚禁

Narrow-line magneto-optical cooling and trapping of strongly magnetic atoms

Andrew J. Berglund, James L. Hanssen, Jabez J. McClelland

摘要:

对弱跃迁进行激光冷却是使多价原子达到超冷温度的有效方法。然而,对于强磁性原子,传统的窄线磁光阱(MOT)会受到光与磁力竞争的影响。我们克服了这个困难,在Er开发一个不寻常的窄线MOT,平衡光学和磁力使用激光调谐到蓝色的一个狭窄的(8 kHz)过渡。陷阱人口自旋极化的温度达到低于2微开尔文。我们的研究结果构成了一种可供选择的方法,激光冷却的弱转变,适用于稀土金属和亚稳碱土金属元素。

英文摘要:

Laser cooling on weak transitions is a useful technique for reaching ultracold temperatures in atoms with multiple valence electrons. However, for strongly magnetic atoms a conventional narrow-line magneto-optical trap (MOT) is destabilized by competition between optical and magnetic forces. We overcome this difficulty in Er by developing an unusual narrow-line MOT that balances optical and magnetic forces using laser light tuned to the blue side of a narrow (8 kHz) transition. The trap population is spin-polarized with temperatures reaching below 2 microkelvin. Our results constitute an alternative method for laser cooling on weak transitions, applicable to rare-earth-metal and metastable alkaline earth elements.

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