An Integrated High-Sensitivity VCSEL-Based Spin-Exchange Relaxation-Free Magnetometer With Optical Rotation Detection
An Integrated High-Sensitivity VCSEL-Based Spin-Exchange Relaxation-Free Magnetometer With Optical Rotation Detection
复制标题
具有旋光检测功能的集成高灵敏度基于 VCSEL 的自旋交换无弛豫磁力计
DOI：
10.1109/jsen.2022.3156814
复制
发表时间：
2022
影响因子：
4.3
通讯作者：
Q. Lin
中科院分区：
文献类型：
--
作者：
Gui;Hongjiang Zeng;Gaobo Tan;Q. Lin
在自旋交换无弛豫(SERF)磁强计的集成设计中，垂直腔面发射激光器(VCSEL)是一种很有前途的光源。然而，垂直腔面发射激光器往往具有较高的频率和幅度噪声，从而阻碍了高灵敏度SERF磁强计的发展。在以往的基于VCSEL的SERF磁强计的光学吸收检测中，为了解决这个问题，在磁强计的电子系统中使用了一个激光控制回路，但由于强的共振吸收，回路的设计是一个具有挑战性的任务。在本文中，我们提出了一种不同的方法，用光学旋转检测代替吸收检测来开发一种基于VCSEL的集成高灵敏度SERF磁强计。在磁强计光学系统中，只需将圆偏振光转换为椭圆偏振光即可实现。这里使用的椭圆偏振光不仅是为了实现像以前的光纤耦合SERF磁强计那样的单光束结构和稳定的分布反馈激光器，更重要的是完成光学旋转检测，从而有力地抑制VCSEL噪声。因此，可以避免具有挑战性的电子控制问题，同时保持简化的光学布置。因此，可以显著降低基于VCSEL的SERF磁强计的集成难度。最终实现了一个基于VCSEL的集成SERF磁强计，其灵敏度约为35FT/Hz1/2。
In the integrated design of spin-exchange relaxation-free (SERF) magnetometers, vertical cavity surface emitting laser (VCSEL) is a promising candidate as a light source. However, VCSEL often has high frequency and amplitude noise, thereby hindering the development of high-sensitivity SERF magnetometers. In the previous VCSEL-based SERF magnetometer with optical absorption detection, a laser control loop in magnetometer electronic system is used to address this issue, but it is a challenging task to design the loop due to the strong resonance absorption. In this paper, we propose a different approach by using optical rotation detection instead of the absorption detection to develop an integrated high-sensitivity VCSEL-based SERF magnetometer. It can be implemented easily, just by switching the circularly polarized light to the elliptically polarized light in magnetometer optical system. The elliptically polarized light used in here is not only to implement a single-beam configuration as in the previous fiber-coupled SERF magnetometer with a stable distributed feedback laser, but more importantly to accomplish the optical rotation detection and hence to strongly suppress the VCSEL noise. Thus the challenging electronic control problem can be avoided, and meanwhile a simplified optical arrangement is maintained. The difficulty of the integration of VCSEL-based SERF magnetometer can then be significantly reduced. Eventually, an integrated VCSEL-based SERF magnetometer is implemented and achieves a sensitivity of approximately 35 fT/Hz1/2. Using the integrated magnetometer, magnetocardiography signals are recorded.