Efficiently loading 40Ca+–27Al+ ion crystal using sympathetic cooling and pulsed laser ablation

We demonstrate a method to efficiently load a pair of 40Ca+–27Al+ ion crystals with sympathetic cooling and pulsed laser ablation, serving as a starting step for the 27Al+ clock. We achieved a technique to rapidly detect the loading of hot ions by monitoring the 2S1/2 → 2D5/2 narrow transition of 40...

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Bibliographic Details
Published in:Review of scientific instruments 2022-11, Vol.93 (11), p.113201-113201
Main Authors: Sun, Chenglong, Cui, Kaifeng, Chao, Sijia, Wei, Yuanfei, Yuan, Jinbo, Cao, Jian, Shu, Hualin, Huang, Xueren
Format: Article
Language:English
Subjects:
Ablation
Calcium isotopes
Cooling
Crystals
Ion pairs
Laser ablation
Pulsed lasers
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Summary:We demonstrate a method to efficiently load a pair of 40Ca+–27Al+ ion crystals with sympathetic cooling and pulsed laser ablation, serving as a starting step for the 27Al+ clock. We achieved a technique to rapidly detect the loading of hot ions by monitoring the 2S1/2 → 2D5/2 narrow transition of 40Ca+ that couples to the shared motional modes between the two ions. The sympathetic cooling time of the 40Ca+–27Al+ ion pair is measured. Two traps are employed to compare the loading time from two directions and it was found that the loading from the axial direction takes much shorter time than loading from the radial direction of the trap. With the help of adaptively controlled trap potential, our method reduced the average loading time of a 40Ca+–27Al+ pair from 26 to 1 min. This research is an important step for increasing the uptime ratio of the 27Al+ optical clock and is useful for other mixed-species ion crystals based on sympathetic cooling.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0109260