1 中国科学院上海应用物理研究所上海 201800
2 中国科学院大学北京 100049
3 中国科学院上海高等研究院上海 201204
正在建设的上海硬X射线自由电子激光装置（Shanghai HIgh repetitioN rate XFEL and Extreme light facility，SHINE）将利用40台周期长度为16 mm、磁长度为4 m、净气隙高度为4 mm的真空内超导波荡器，以产生垂直线极化的自由电子激光。霍尔探头磁场测量是目前测量波荡器场图最可靠的测量方法之一，而霍尔探头灵敏中心的定位精度是影响磁场测量精度的主要因素之一。本文介绍了这些超导波荡器的磁场点测量系统，以及霍尔探头灵敏中心的高精度位置标定。通过翻转安装有霍尔探头与角锥棱镜的磁测滑车，可分别标定霍尔探头灵敏中心以及角锥棱镜顶点和磁测滑车翻转轴的横向间距，从而获得霍尔探头灵敏中心彼此之间的横向距离，以及霍尔探头灵敏中心与角锥棱镜顶点之间的横向距离。该方法的标定精度好于，能满足该超导波荡器磁场测量的要求。
超导波荡器 磁场点测量 三维激光定位 Superconducting undulator (SCU) Local magnetic field measurement 3D laser positioning system
1 北京航空航天大学仪器科学与光电工程学院，北京 100191
2 北京航空航天大学杭州创新研究院，浙江 杭州 310023
量子精密测量在基础研究和原始创新中发挥了重要作用。激光与热碱金属原子系综的相互作用是量子精密测量领域的重要研究对象，在物理学的前沿探索和技术应用层次上都具有深刻意义，是科学研究的前沿热点之一。基于激光与原子相互作用原理，相关器件的超高精度、小型化、阵列化进程从原理与技术上获得了突破性的进展，形成了以无自旋交换弛豫（SERF）原子磁强计、相干布居数囚禁（CPT）原子钟、SERF原子自旋陀螺仪为代表的精密测量传感器件。本文结合近十几年来相关领域在磁场测量、时间测量、惯性测量方面的代表性成果和进展，从原理和应用两个角度总结了目前激光与热碱金属原子系综相互作用的研究状况，展望了基于激光与热碱金属原子系综相互作用原理的器件未来的发展方向。
量子光学 热碱金属原子系综 激光与原子相互作用 磁场测量 时间测量 惯性测量 激光与光电子学进展
2023, 60(15): 1500005
Haobin Lin 1,2,3Ce Feng 1,2,3Yang Dong 1,2,3Wang Jiang 1,2,3[ ... ]Fangwen Sun 1,2,3
Author Affiliations
Abstract
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
4 National Key Laboratory of ASIC, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
Nitrogen-vacancy color centers can perform highly sensitive and spatially resolved quantum measurements of physical quantities such as magnetic field, temperature, and pressure. Meanwhile, sensing so many variables at the same time often introduces additional noise, causing a reduced accuracy. Here, a dual-microwave time-division multiplexing protocol is used in conjunction with a lock-in amplifier in order to decouple temperature from the magnetic field and vice versa. In this protocol, dual-frequency driving and frequency modulation are used to measure the magnetic and temperature field simultaneously in real time. The sensitivity of our system is about and , respectively. Our detection protocol not only enables multifunctional quantum sensing, but also extends more practical applications.
quantum sensing temperature measurement magnetic field measurement Chinese Optics Letters
2023, 21(1): 011201
Author Affiliations
Abstract
1 State Key Laboratory of The Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
2 China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400039, China
3 Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
A novel fiber-optic magnetic field sensor with high interrogation speed and resolution by using an etched fiber Bragg grating (FBG) in conjunction with a dual-loop optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. A commercial FBG is firstly dipped into mixed hydrofluoric acid solution to remove the cladding layer and then is embedded with the magnetic fluid (MF) as a sensing element. The central wavelength reflected from the FBG is related to the overall time delay of the dual-loop OEO, which determines the oscillating frequency of the OEO. Therefore, the magnetic field can be estimated by measuring the oscillating frequency shift of OEO. The experimental results show that the oscillating frequency linearly increases with the increment of the magnetic field, achieving the sensitivity of 16.3 Hz/Oe with an R-square of 0.991 in the range of 5 mT-10 mT. In addition, the maximum error is within ±0.05 mT in the range of 7 mT-8 mT, which offers potentials in many fields where the high-precision magnetic field measurement is required.
Etched fiber Bragg grating optoelectronic oscillator magnetic fluid magnetic field measurement Photonic Sensors
2022, 12(4): 220419
1 暨南大学 1. 理工学院 光电工程系
2 2. 光电信息与传感技术广东普通高校重点实验室
3 暨南大学 2. 光电信息与传感技术广东普通高校重点实验室
4 3. 广东省光纤传感与通信技术重点实验室, 广州 510632
磁流体具有优异的磁光特性, 为光纤磁场传感器的实现提供了一种新途径, 经过十多年发展, 已经成为光纤磁传感领域的一个重要研究方向。目前, 已有大量的基于不同结构和原理的磁流体型光纤磁场传感器被相继提出, 且总体上经历了从标量到矢量磁场传感的发展, 文章以该发展脉络为主线, 对磁流体的磁光特性、传感器的实现方法进行梳理和总结, 最后指出当前仍存在的一些问题并进行展望。
光纤传感 磁场测量 磁流体 optical fiber sensing magnetic field measurement magnetic fluids
强激光与粒子束
2022, 34(8): 084003
强激光与粒子束
2022, 34(4): 043003
1 华东师范大学 精密光谱科学与技术国家重点实验室, 上海 200241
2 山东大学 山东省金刚石材料与半导体器件重点实验室, 济南 250101
3 济南金刚石科技有限公司, 济南 250101
4 山西大学 极端光学协同创新中心, 山西 030006
为了解决在基于金刚石氮-空位（NV）色心的磁场高灵敏度测量中, 高速获取磁场信号引起的NV色心发光强度的微小变化的技术瓶颈问题, 自行设计出一套能够实现金刚石NV色心自发辐射和受激辐射信号同步测量的光学系统, 并利用一个长焦距透镜收集金刚石NV色心受激辐射信号, 从而尽最大可能地滤除金刚石NV色心的自发辐射信号, 提高测量受激放大增益的信噪比。实验中成功观察到NV色心零声子线的受激辐射放大, 分析了抽运光功率、信号光功率、抽运光偏振方向和信号光偏振方向对放大特性的影响。结果表明, 通过对抽运光和信号光相关参量的优化调整, 最终获得了10.5%的受激辐射增益。该研究为实现NV光放大远程磁场监测奠定了研究基础。
激光技术 受激辐射放大 金刚石色心 量子传感 磁场测量 laser technique stimulated radiation amplification diamond color center quantum sensing magnetic field measurement
强激光与粒子束
2021, 33(8): 084001
