近日，中国科学院精密测量科学与技术创新研究院的黄垚&陈正团队取得一项新进展。他们实现了⁴⁰Ca⁺离子的长寿期光学俘获。相关研究成果已于2024年11月11日在《中国物理快报》上发表。

该研究团队已在实验中实现了对⁴⁰Ca⁺离子的全光学俘获。研究人员利用一束高功率、远离共振、紧密聚焦的532纳米波长激光，构建了一个光偶极阱。单个⁴⁰Ca⁺离子在没有任何射频场的情况下被俘获，并展现出了超过3秒的长寿期。

在实验中，研究人员采取了多项措施来提高光俘获的概率，包括将偶极光束腰聚焦至接近衍射极限、精确补偿杂散电场以及减轻亚稳态中的电子跃迁。

⁴⁰Ca⁺离子的光学俘获消除了射频场引起的微动影响，为全光学俘获离子光学钟的开发铺平了道路。

附：英文原文

Title: Long-Lifetime Optical Trapping of a ⁴⁰Ca⁺ Ion

Author:Zheng Chen^1,2,3†, Miao Wang^1,2†, Baolin Zhang^1,2, Huaqing Zhang^1,2, Zixiao Ma^1,2,3, Ruming Hu^1,2,3, Yao Huang^1,2*, Kelin Gao^1,2, and Hua Guan^1,2,4

Issue&Volume: 2024-11-11

Abstract: We have experimentally achieved the all-optical trapping of a 40Ca+ ion. An optical dipole trap was established using a high-power, far-detuned, tightly focused laser with a wavelength of 532nm. The single 40Ca+ ion was trapped without any RF fields and demonstrated a long lifetime of over 3s. In this experiment, we implemented several measures to improve the optical trapping probability, including focusing the dipole beam waist near the diffraction limit, precisely compensating for stray electric fields, and mitigating electron shelving in metastable states. The optical trapping of a 40Ca+ ion eliminates the influence of micromotion induced by RF fields, potentially paving the way for development of all-optical trapping ion optical clocks.

DOI: 10.1088/0256-307X/41/11/113701

Source: https://cpl.iphy.ac.cn/10.1088/0256-307X/41/11/113701