用于钙离子全光囚禁的离子囚禁装置研究

Research on ion trapping devices for all-optical trapping of calcium ions

随着离子光钟技术的飞速发展,由离子光钟中用来囚禁离子的射频场带来的微运动效应对其性能的影响也越来越不可忽略。为彻底消除这一效应,提出了全光囚禁离子光钟的实验方案。针对这一实验方案,设计并搭建了用于钙离子全光囚禁的离子囚禁装置。该装置是采用刀片型离子阱设计,能够实现剩余力仅有10^(-20) N量级的高精度的杂散电场补偿;具备6 mm的通关孔径,很好满足了全光囚禁实验中偶极囚禁激光的通过需求;基于改良的螺旋谐振器设计搭建的射频系统能够实现在9.33(1)MHz较低射频频率下的稳定耦合;结合高达10^(-9) Pa的真空制备和装配导电玻窗的真空腔体,可以实现长时间的离子囚禁。为全光囚禁钙离子提供了实验基础,对光学囚禁离子光钟的实现具有重大意义。

With the rapid development of ion optical clock technology,the impact of the micro-motion effect caused by the radio frequency field used to trap ions in ion optical clock on its performance is becoming more and more negligible.In order to completely eliminate this effect,an experimental scheme of all-optical trapping ion optical clock was proposed.In view of this experimental scheme,an ion trapping device for all-optical trapping of calcium ions was designed and constructed.The device adopts a blade ion trap design,which can realize high-precision stray electric field compensation with a residual force of only on the order of 10^(-20) N,and has a clearance aperture of 6 mm,which can well meet the passing requirements of dipole trapping laser in all-optical trapping experiments,and the radio frequency(RF)system based on the improved helical resonator design can achieve stable coupling at a low RF frequency of 9.33(1)MHz,and can realize long-term ion trapping by combining vacuum preparation of up to 10^(-9) Pa and vacuum chamber with conductive glass window.It provides an experimental basis for all-optical trapping of calcium ions,and is of great significance for the realization of optical trapping ion optical clocks.