摘要
相干布居俘获(CPT)磁强计是基于原子系综中相干布居俘获相干叠加暗态使用全光学的方法对磁场进行测量,具有较高的精度。实验中使用注入锁定的方法得到频率差严格等于铯原子基态超精细分裂间距的两束大频差位相锁定的双色激光,观察到了铯原子气室中的CPT透射信号。给铯泡加入沿激光传播方向的纵向磁场,可观察到变宽或分裂的CPT信号,通过对分裂间距的测量便可得到待测磁场值。对于中等强度的磁场,可通过透射峰的裂距直接得到待测磁场值;弱磁场区域则可通过电流与磁场的对应关系得到。目前,实验中可测量nT量级的稳定磁场。
Coherent population trapping(CPT)magnetometer is based on coherent population trapping coherent dark states,using an all-optical method to measure the magnetic field with high accuracy.In our experiment,we used the method of injection locking to get the two color lasers with locked phase and large frequency difference,which equald to the hyperfine splitting of the cesium atoms′ground states,and observed the CPT transmission signals.We added the longitudinal magnetic field which was along the laser propagation direction,and observed the widen CPT transmission peak and the splitting signals.For the magnetic field of medium intensity,we got the magnetic field value by measuring the splitting spacing,and for the weak region,the value could be obtained by the relation of current and magnetic field.In our experiment,we could measure the static field with several nT.
出处
《量子光学学报》
CSCD
北大核心
2013年第4期312-316,共5页
Journal of Quantum Optics
基金
国家自然科学基金(项目批准号:61227902
11274213
61205215)
国家自然科学基金创新群体项目(项目批准号:61121064)
国家自然科学基金大学生人才培养基金项目(J1103210)的部分资助
国家重大科学研究计划(编号:2012CB921601)
山西省回国留学人员科研经费(2012-015)
山西省太原市科技明星专项(12024707)的部分
关键词
相干布居俘获
原子磁强计
弱磁场测量
铯原子
Coherent population trapping
atomic magnetometer
weak magnetic field measurement
cesium atoms