非线性磁光效应用于测量磁光阱四极磁场的方案

为了研究磁光阱冷原子团所在区域的磁场大小，从而得出磁场零点附近磁场的微弱变化及其分布。提出利用右旋圆偏振作为探测光场穿过冷原子，根据左右旋圆偏振光场引起的跃迁几率的不同，导致穿过冷原子团零点前后探测场跃迁几率的变化，用来计算零点附近由冷原子团引起的非线性磁光效应，通过这一效应推导出旋转角随磁场大小的变化，从而获得了磁光阱四极磁场零点附近数量级达到10^-13T的磁场值。利用这一效应，同时在理论上获得了不同于以往理论及实验的双峰色散曲线。

A Proposal for the Measurement of Quadrupole Field of Magneto-Optical Trap with Nonlinear Magneto-Optical Rotation

In order to make sure the magnetic field distribution around the magneto optical trap cold atoms, the weak variation and distribution around the zero point magnet field can be analyzed. A theoretical analysis is based on the interaction between cold atoms and right hand circular probe beams. For different transition probability of left and right hand circularly polarized probe beam before and after zero point magnetic field, nonlinear magnetic optical rotation (NMOR) induced by cold atoms is computed around the zero point of 87 Rb magneto optical trap. Using such NMOR effects, rotation angle variation with the magnetic field can be got, even up to an order of magnitude 10 -13 T. In the mean time, with such effect a two peak dispersionlike structure is developed, which is different from the results mentioned in other papers.