利用微机械非蒸散吸气剂泵增强磁光阱的观测时间
Enhanced observation time of magneto-optical traps using micro-machined non-evaporable getter pumps
摘要：
研究表明，在没有其他抽真空机制的情况下，微机械非蒸发吸气剂泵（NEGs）可以延长激光冷却原子在磁光阱（MOT）中产生的时间。在第一项研究中，我们将硅玻璃微加工超高真空（UHV）细胞与硅蚀刻NEG腔和铝硅酸盐玻璃（ASG）窗口，并证明了一个重复加载MOT的观察超过10分钟的时间内与一个单一的激光激活NEG。在第二项研究中，被动泵浦激光激活的NEG材料的能力进一步研究在硼硅酸盐玻璃吹制比色皿细胞含有五个NEG片。在该细胞中，MOT在没有任何外部主动泵送系统的情况下保持可见超过4天。这个MOT观测时间超过了在无NEG情况下获得的观测时间几乎五个数量级。细胞的可扩展性和潜在的真空寿命可能与NEG材料可能使未来的小型化冷原子仪器的发展。
英文摘要：
We show that micro-machined non-evaporable getter pumps (NEGs) can extend the time over which laser cooled atoms canbe produced in a magneto-optical trap (MOT), in the absence of other vacuum pumping mechanisms. In a first study, weincorporate a silicon-glass microfabricated ultra-high vacuum (UHV) cell with silicon etched NEG cavities and alumino-silicateglass (ASG) windows and demonstrate the observation of a repeatedly-loading MOT over a 10 minute period with a single laser-activated NEG. In a second study, the capacity of passive pumping with laser activated NEG materials is further investigated ina borosilicate glass-blown cuvette cell containing five NEG tablets. In this cell, the MOT remained visible for over 4 days withoutany external active pumping system. This MOT observation time exceeds the one obtained in the no-NEG scenario by almostfive orders of magnitude. The cell scalability and potential vacuum longevity made possible with NEG materials may enable inthe future the development of miniaturized cold-atom instruments.
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