强激光与粒子束
2024, 36(4): 043032
Author Affiliations
Abstract
We propose an in-situ method to calibrate the coil constants of the optical atomic magnetometer. This method is based on measuring the Larmor precession of spin polarized alkali metal atoms and has been demonstrated on a K-Rb hybrid atomic magnetometer. Oscillation fields of different frequencies are swept on the transverse coil. By extracting the resonance frequency through phase-frequency analysis of electron spin projection, the coil constants are calibrated to be 323.1 ± 0.28 nT/mA, 108 ± 0.04 nT/Ma, and 185.8 ± 1.03 nT/mA along the X, Y, and Z directions, respectively.
Optical atomic magnetometer coil constant calibration phase-frequency analysis Larmor precession Photonic Sensors
2019, 9(2): 02189
Author Affiliations
Abstract
School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China
A superluminescent diode (SLD) as an alternative of laser is used to detect optical rotation for atomic spin precession. A more uniform Gauss configuration without additional beam shaping and a relatively high power of the SLD have a potential for atomic magnetometers, which is demonstrated in theory and experiments. In addition, the robustness and compactness enable a more practical way for optical rotation detections, especially for applications in magnetoencephalography systems.
Superluminescent diode atomic magnetometer magnetoencephalography atomic spin precession detection Larmor precession Photonic Sensors
2019, 9(2): 02135
1 运城学院物理与电子工程系, 山西 运城 044000
2 山西大学理论物理研究所, 山西 太原 030006
3 河南师范大学物理与信息工程学院, 河南 新乡 453007
通过构造自旋的经典对应物理量和系统的拉氏量, 研究二维中心势场中的中性自旋粒子在磁场驱动下的经典动力学, 并利用自旋相干态推导出的自旋期待值的时间演化与经典动力学方程完全一致而且波函数的几率云局域于经典轨道上, 发现了有趣的量子-经典完全对应现象。
量子-经典对应 Larmor进动 中性自旋粒子 quantum-classical correspondence larmor precession neutral spin particl