Nonlinear magneto-optical rotation in optically thick media
S. M. Rochester, D. Budker
非线性磁光旋转是一种灵敏的磁场测量技术。在这里，散粒噪声限制的磁力灵敏度分析的情况下，光学厚介质和高光功率，这一直是最近的实验和理论研究的主题。
Nonlinear magneto-optical rotation is a sensitive technique for measuring magnetic fields. Here, the shot-noise-limited magnetometric sensitivity is analyzed for the case of optically-thick media and high light power, which has been the subject of recent experimental and theoretical investigations.
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Cooperative emission of a pulse train in an optically thick scattering medium
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Electromagnetically induced absorption in magneto-optically trapped atoms
在磁光阱中，利用低强度连续共传播泵浦光场和探测光场，在$% ^{85}Rb$样品上观察到电磁诱导吸收（EIA）。在中等俘获场强下，EIA谱由俘获四极磁场对原子基态产生的塞曼效应决定。使用EIA光谱的磁场映射的冷原子样品的说明。
We experimentally investigate the influence of the orientation of optically pumped magnetometers in Earth's magnetic field. We focus our analysis to an operational mode that promises femtotesla field resolu-tions at such field strengths. For this so-called light-shift dispersed Mz(LSD-Mz) regime, we focus on the key parameters defining its performance. That are the reconstructed Larmor frequency, the transfer function between output signal and magnetic field amplitude as well as the shot noise limited field resolution. We demonstrate that due to the use of two well balanced laser beams for opt…
An optically modulated zero-field atomic magnetometer with suppressed spin-exchange broadening
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Optically Pumped Magnetometry in Arbitrarily Oriented Magnetic Fields
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Measuring magnetic field coil constants based on atomic magnetometry and fluxgate magnetometry
该研究利用光泵浦铷自由感应衰减磁力计和磁通门磁力计在磁屏蔽条件下测量磁场线圈常数，通过比较获得0.9967的校准因子，实现了原子磁力计对磁通门磁力计的校准，方法简单易行。
When optically pumped magnetometers are aimed for the use in Earth's magnetic field, the orientation of the sensor to the field direction is of special importance to achieve accurate measurement result. Measurement errors and inaccuracies related to the heading of the sensor can be an even more severe problem in the case of special operational configurations, such as for example the use of strong off-resonant pumping. We systematically study the main contributions to the heading error in systems that promise high magnetic field resolutions at Earth's magnetic field strengths, namely the non-li…
Optimization and vectorization of a Mz-type optically-pumped Rubidium magnetometer
本文提出一种Mz型光学泵铷磁强计，通过优化泵光强度和射频磁场，提升灵敏度至22.9 pT/Hz^{1/2}，并利用三轴调制和频域解调实现矢量磁场检测。
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Backward-emitted sub-Doppler fluorescence from an optically thick atomic vapor
文献仅偶然提到致密蒸气向后荧光激发光谱中的亚多普勒贡献。这种贡献在这里研究Cs蒸气，无论是在第一共振线（894 nm）和较弱的第二共振线（459 nm）。我们表明，在一个强吸收介质中，淬火的激发原子移动到一个窗口照射下近垂直入射减少了激发光谱的红色一侧的荧光。缓慢地向窗口移动的原子产生亚多普勒速度选择性贡献，其可见性在此通过应用频率调制技术来改善。这种亚多普勒特征，诱导的表面淬火结合短的吸收长度的入射照射，表现出密切的类比与薄蒸汽细胞出现的窄光谱。我们还表明，一个正常的入射照射是必不可少的亚多普勒功能被观察到，而它应该是独立的检测几何
We demonstrate laser cooling and magneto-optical trapping of europium. The atoms are optically pumped to a metastable state and then loaded from an atomic-beam source via conventional Zeeman slowing and magneto-optical trapping techniques using a $J=13/2\leftrightarrow J=15/2$ quasi-cyclic transition. The trapped populations contained up to $1\times 10^7$ atoms, and a two-body loss rate is estimated as $1\times10^{-10}\,\mathrm{cm^3/s}$ from the non-exponential loss of atoms at high densities. We also observed leakage out of the quasi-cyclic transition to the two metastable states with $J=9/2$…
Active narrowband filtering, line narrowing and gain using ladder electromagnetically induced transparency in an optically thick atomic vapour
研究了在光学厚Rb原子蒸气中利用$5\rm{S}_{1/2}\rightarrow5\rm{P}_{3/2}\rightarrow5\rm{D}_{5/2}$梯形系统产生的电磁感应透明共振。我们观察到一个强大的线窄化效果和增益在$5\rm{S}_{1/2}\rightarrow5\rm{P}_{3/2}$过渡波长由于能量池辅助频率转换的特性类似于四波混频。结果，可以观察到振幅接近$100\%$且线宽为15 MHz的可调谐和可切换的透明共振。此外，大的线窄化效应允许即使在强功率展宽的存在下也能分辨$^{85}$ Rb $5\rm{D}_{5/2}$超精细结构。
High-precision control of static magnetic field magnitude, orientation, and gradient using optically pumped vapour cell magnetometry
本文介绍了一个由硬件和软件组成的综合系统，它可以精确地定义五层多金属屏蔽内高达|B| = 1 μT的任意方向的磁场。参照在6S $_{1/2}$ F = 4 $^{133}$ Cs基态的塞曼态之间观察到的磁共振来校准该系统。证明了整个4π立体角上的磁场定义，幅度、方向和梯度的一σ公差分别为δ |B| = 0.94 nT、δθ = 5.9 mrad和δ $\nabla$ B = 13.0 pT/mm。该场控制用于根据静态场（B 0）取向来经验性地映射Mx磁力计信号幅度。
Optimisation of Magnetic Field Sensing with Optically Pumped Magnetometers for Magnetic Detection Electrical Impedance Tomography
本研究通过计算建模优化磁探测电阻抗断层成像的光泵磁力计配置，发现单轴垂直测量及小型高灵敏度传感器阵列可获最佳图像质量，为未来OPM设计提供依据。
Phase projection errors in rf-driven optically pumped magnetometers
本研究分析了射频驱动光学泵磁强计中射频激励场与光功率调制之间的相位关系，揭示了$M_x$磁强计在响应时间和准确性方面的限制，特别是在使用主动电子反馈时。
A modular optically pumped magnetometer system
针对医疗和工业的空间分辨磁成像需求，提出含高灵敏度量子磁力计阵列的模块化OPM系统，支持快速重构与多种阵列布局，测试显示其梯度灵敏度达10 fT/cm/√Hz、带宽超200Hz，可测脊髓信号。
We present an apparatus to overcome the limitations of mechanical raster-scanning in electromagnetic induction imaging (EMI) techniques by instead performing a 2D optical raster-scan within the vapour cell of a radio-frequency atomic magnetometer (RF-AM). A large cuboidal 87Rb vapour cell is employed to act as the medium of an RF-AM with the pump and probe beams translated in the cell via acousto-optics. The technique is shown to give robust and repeatable magnetic measurements over the cell volume and successfully resolves conductive targets with EMI. Optical raster-scanning removes the limit…
We study the effect of optical polarization squeezing on the performance of a sensitive, quantum-noise-limited optically pumped magnetometer. We use Bell-Bloom (BB) optical pumping to excite a $^{87}$Rb vapor containing $8.2 \cdot 10^{12} \mathrm{atoms/cm^3}$ and Faraday rotation to detect spin precession. The sub-$\mathrm{pT}/\sqrt{\mathrm{Hz}}$ sensitivity is limited by spin projection noise (photon shot noise) at low (high) frequencies. Probe polarization squeezing both improves high-frequency sensitivity and increases measurement bandwidth, with no loss of sensitivity at any frequency, a d…
We present a portable optically pumped magnetometer instrument for ultra-sensitive measurements within the Earth's magnetic field. The central part of the system is a sensor head operating a MEMS-based Cs vapor cell in the light-shift dispersed Mz mode. It is connected to a compact, battery-driven electronics module by a flexible cable. We briefly review the working principles of the device and detail on the realization of both, sensor head and electronics. We show shielded and unshielded measurements within a static magnetic field amplitude of 50 uT demonstrating a noise level of the sensor s…
Demonstration of magnetically silent optically pumped magnetometers for the TUCAN electric dipole moment experiment
本研究演示了一款用于TUCAN电偶极矩实验的无磁光泵铯磁强计，其具备高灵敏度与高稳定性，支持单激光驱动多传感器，可用于高灵敏度磁学测量场景。
Exponential enhancement of sensitivity in Ramsey interferometry with optically thick ensemble of atoms
该研究通过理论预测与实验证实，利用光学厚原子系综中原子的反作用实现Ramsey共振线宽的指数级收窄，将提升新一代固态原子钟的测量灵敏度。
Optically pumped vector magnetometer using a strong bias magnetic field
本研究提出一种基于强偏置磁场的光泵矢量磁强计新方法，利用光窄化效应抑制自旋交换弛豫，实现地球磁场环境下无屏蔽的高灵敏度矢量磁场测量。
An optically pumped magnetic gradiometer for the detection of human biomagnetism
本文提出基于非线性磁光旋转的本征光泵磁梯度仪，实现18 fT/cm/√Hz灵敏度和最高30 dB共模噪声抑制，并成功用于脑听觉诱发响应与抗干扰实时心磁图检测。
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