公开(公告)号：US20130048846A1

公开(公告)日：2013-02-28

申请号：US13598129

申请日：2012-08-29

申请人： Shengwang DU ,  Shanchao ZHANG ,  Shuyu ZHOU ,  Guang Yu YIN ,  Chinmay BELTHANGADY

发明人： Shengwang DU ,  Shanchao ZHANG ,  Shuyu ZHOU ,  Guang Yu YIN ,  Chinmay BELTHANGADY

IPC分类号： G02B27/00

CPC分类号： G21K1/006

摘要： A two-dimensional (2D) magneto-optical trap (MOT) for alkali neutral atoms establishes a zero magnetic field along the longitudinal symmetry axis. Two of three pairs of trapping laser beams do not follow the symmetry axes of the quadruple magnetic field and are aligned with a large non-zero degree angles to the longitudinal axis. In a dark-line 2D MOT configuration, there are two orthogonal repumping beams. In each repumping beam, an opaque line is imaged to the longitudinal axis, and the overlap of these two line images creates a dark line volume in the longitudinal axis where there is no repumping light. The zero magnetic field along the longitudinal axis allows the cold atoms maintain a long ground-state coherence time without switching off the MOT magnetic field, which makes it possible to operate the MOT at a high repetition rate and a high duty cycle.

摘要翻译： 用于碱性中性原子的二维（2D）磁光阱（MOT）沿纵向对称轴建立零磁场。 三对俘获激光束中的两对不遵循四极磁场的对称轴，并且与纵向轴线以非零度角大的对准。 在暗线2D MOT配置中，有两个正交的重排光束。 在每个排放光束中，不透明线被成像为纵向轴线，并且这两条线图像的重叠在不存在排斥光的纵轴上产生暗线体积。 沿着纵轴的零磁场允许冷原子保持长的基态相干时间，而不关闭MOT磁场，这使得可以以高重复率和高占空比操作MOT。