相比于传统的红失谐偶极势阱,蓝移阱中原子在排斥势的作用下被囚禁在光强最弱的地方,有助于减弱光子散射率和激光对原子能级的光频移,从而使蓝移阱在单原子俘获和操控方面具有明显优势.在单原子俘获实验中,一般阱的尺寸在微米尺度,要小于通常CCD的像素尺寸,对微尺度光学阱的精密测量是构建单原子操控光学阱的重要一步.在本文中,我们利用特殊的透镜组将1.5μm大小的蓝移阱放大,再通过普通CCD获得x-y方向图像,重构出y-z和x-z方向阱的信息,进而获得了微尺度阱的三维结构,并对阱的参数进行了估算.

Compared with the red detuned trap,the blue-detuned dipole trap can trap the atoms at the region of no light,which reduces the photon scattering rate and the ac Stark shift induced by the trapping laser and that is helpful for coherent control of single atoms. In the usual experiment of trapping single atoms,the size of the trap is at 1.0μm scale which is less than that of CCD pixel size and it is difficult to measure that micro dipole trap in 3 dimensionally with the usual methods. Here we report a method to measure and reconstruct the 3D micro-blue bottle trap. The blue-detuned dipole trap with the size of 1.5μm is amplified through a special designed objective and measured by CCD and the information of the trap in the x-z plane and y-z plane is reconstructed by the measured information in x-y plane. 3D reconstruction of the blue trap with complex structure is then finished and the parameters of the micro-trap are estimated.