光学学报, 2004, 24 (7): 989, 网络出版: 2010-05-25
非线性磁光效应用于测量磁光阱四极磁场的方案
A Proposal for the Measurement of Quadrupole Field of Magneto-Optical Trap with Nonlinear Magneto-Optical Rotation
量子光学 冷原子物理 非线性磁光效应 冷原子 右旋圆偏振光场 quantum optics cold atom physics nonlinear magneto-optical effect cold atoms right-hand circularly polarized beam
摘要
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10-13 T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。
Abstract
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 87Rb 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.
贺凌翔, 王育竹. 非线性磁光效应用于测量磁光阱四极磁场的方案[J]. 光学学报, 2004, 24(7): 989. He Lingxiang, Wang Yuzhu. A Proposal for the Measurement of Quadrupole Field of Magneto-Optical Trap with Nonlinear Magneto-Optical Rotation[J]. Acta Optica Sinica, 2004, 24(7): 989.