Bennetts Shayne, Chen Chun-Chia, Pasquiou Benjamin, Schreck Florian
Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands.
Phys Rev Lett. 2017 Dec 1;119(22):223202. doi: 10.1103/PhysRevLett.119.223202.
We demonstrate a continuously loaded ^{88}Sr magneto-optical trap (MOT) with a steady-state phase-space density of 1.3(2)×10^{-3}. This is 2 orders of magnitude higher than reported in previous steady-state MOTs. Our approach is to flow atoms through a series of spatially separated laser cooling stages before capturing them in a MOT operated on the 7.4-kHz linewidth Sr intercombination line using a hybrid slower+MOT configuration. We also demonstrate producing a Bose-Einstein condensate at the MOT location, despite the presence of laser cooling light on resonance with the 30-MHz linewidth transition used to initially slow atoms in a separate chamber. Our steady-state high phase-space density MOT is an excellent starting point for a continuous atom laser and dead-time free atom interferometers or clocks.
我们展示了一种连续加载的(^{88}Sr)磁光阱（MOT），其稳态相空间密度为(1.3(2)\times10^{-3})。这比之前稳态磁光阱中报道的数值高两个数量级。我们的方法是让原子流经一系列空间上分离的激光冷却阶段，然后在一个使用混合慢化器 + 磁光阱配置、基于线宽为(7.4kHz)的(Sr)原子间组合线运行的磁光阱中捕获它们。我们还展示了在磁光阱位置产生玻色 - 爱因斯坦凝聚体，尽管存在与用于在单独腔室中最初慢化原子的线宽为(30MHz)的跃迁共振的激光冷却光。我们的稳态高相空间密度磁光阱是连续原子激光器以及无死时间原子干涉仪或原子钟的理想起点。
