An ultra-bright atom laser
An ultra-bright atom laser
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超亮原子激光器
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
W. V. Klitzing
中科院分区：
文献类型：
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作者：
V. Bolpasi;V. Bolpasi;N. Efremidis;Michael J. Morrissey;P. Condylis;P. Condylis;D. Sahagun;D. Sahagun;Mark Baker;W. V. Klitzing
我们提出了一种新型的超亮原子激光器和一种超冷的热原子束。利用射频辐射，我们在玻色-爱因斯坦凝聚体中强耦合了87Rb原子的磁性超精细能级。由此产生的依赖于时间的绝热势能形成一个陷阱，在低RF频率下，该陷阱恰好在凝聚体的下方打开，从而允许非常明亮的、准直良好的原子激光束出现。与传统的基于磁性超精细能级弱耦合的原子激光不同，这种技术允许我们以任意大的速率将原子耦合出去。我们获得了4×10~7个原子S-1的通量，与迄今为止最亮的原子激光相比增加了7倍。此外，我们还用两个数量级演示了最冷的热原子束(200nK)。
We present a novel, ultra-bright atom laser and an ultra-cold thermal atom beam. Using rf-radiation we strongly couple the magnetic hyperfine levels of 87Rb atoms in a trapped Bose–Einstein condensate. The resulting time-dependent adiabatic potential forms a trap, which at low rf-frequencies opens just below the condensate and thus allows an extremely bright well-collimated atom laser beam to emerge. As opposed to traditional atom lasers based on weak coupling of the magnetic hyperfine levels, this technique allows us to outcouple atoms at an arbitrarily large rate. We achieve a flux of 4×107 atom s-1, a seven fold increase compared to the brightest atom lasers to date. Furthermore, we demonstrate by two orders of magnitude the coldest thermal atom beam (200 nK).