PWM Bell-Bloom磁力计中的周期性自旋动力学与占空比优化
Transient Dynamics and Duty-Cycle Optimization in a Pulse-Wwidth Modulation Bell--Bloom Pumping
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中文总结 AI 辅助
本研究针对PWM Bell-Bloom原子磁力计，建立布洛赫方程模型描述自旋动力学，校准弛豫率并验证模型，发现最大化信号振幅未必优化灵敏度，为该类磁力计的参数优化提供实用框架。
中文摘要 AI 辅助
我们研究了脉冲宽度调制（PWM）Bell-Bloom原子磁力计的占空比相关响应。建立布洛赫方程模型以描述泵浦开启与泵浦关闭时的自旋动力学，得到解析瞬态解与周期性稳态描述。引入扩展自由感应衰减拟合方法校准有效弛豫率$W$和$W_0$，并将其用于预测调制后的原子响应。该模型与近共振工作区域内的时域波形测量、快速虚拟锁相分析及实际硬件锁相测量结果相符。我们表明，最大化信号振幅通常并不能优化磁力计灵敏度，因为锁相斜率还取决于失谐相关的相位响应。研究结果为PWM调制原子磁力计的占空比和泵浦速率优化提供了实用框架。
英文摘要
We investigate the duty-cycle-dependent atomic response under full-depth intensity pulse-width modulation in Bell--Bloom optical pumping. A time-domain Bloch model explicitly resolves the pump-on/off spin dynamics, yielding piecewise analytical transient solutions and a periodic steady-state description without cycle averaging or harmonic truncation. An extended free-induction-decay method independently determines the effective dark and pump-on transverse-relaxation rates, $W_0$ and $W$. The predicted lock-in responses agree well with experimental results. We find that for each Larmor frequency $ω_0$, the slope is maximized at a finite pump rate that increases with $ω_0$. These results provide a practical framework for sensitivity-oriented optimization of the duty cycle and pump rate in PWM-driven atomic magnetometers.
发表机构
- School of Physics, Hefei University of Technology（合肥工业大学物理学院）
- Key Laboratory of Opto-Electronic Information Acquisition and Manipulation (Anhui University), Ministry of Education（教育部光电信息获取与控制重点实验室（安徽大学））
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