Bonded-Multipass-Cavity Assisted Atomic Magnetometer

Atomic magnetometers use the precession of atomic spin for magnetic field detections.The development in this field is to improve the sensor sensitivity,bandwidth,dynamical range,spatial resolution,and reduce the volume and power consumption.In past decades,there are have been significant breakthrough in both the theoretical background and technologies.It has been the main direction in atomic magnetometry to develop the sensors for real life applications.The research in this thesis focuses on improving the performance of the atomic magnetometers while keeping its size compact.This thesis includes the following sections:In Sec.?,we set up a system for the atomic cell fabrication with a multi-pass cavity anodic bonded inside.We optimize this system by studying various parameters in this system,and work out a standardized procedure for this process,which has the potential for industrial applications.In Sec.?,we apply the cell developed in Sec.? to scalar magnetometers.Scalar magnetometers has a large detection bandwidth and dynamical range,however,its sensitivity is usually limited by the relatively low signal-to-noise ratio.With this multipass cavity,we reach a magnetic field sensitivity to be better than 50 fT/Hz1/2 working in the close-loop mode.In Sec.? and Sec.V,we combine the multipass cavity with a dual-optically-pumped Bell-Bloom magnetometer,and realize an all-optical vector magnetometer.We optimize the performance of this vector magnetometer,and reach a magnetic field orientation sensitivity better than 10 urad/Hz1/2 at frequencies larger than 10 Hz,while the scalar magnetic field sensitivity is maintained at 0.5 pT/Hz1/2.