AI 中文总结
本文针对中层大气钠磁测量中激光线宽与啁啾仅单独优化的问题，通过联合模拟揭示二者协同效应，为高灵敏度磁强计设计提供指导。
AI 中文摘要
基于激光导星的中层大气钠磁测量可测量90km附近的地磁场，其灵敏度取决于激光线宽与啁啾，但此前研究仅分别优化这两个参数。本文采用速度分辨的密度矩阵模拟，对拉莫尔同步脉冲Na D₂泵浦的两个参数进行联合扫描。线宽与啁啾存在协同效应：当啁啾承担反冲抑制作用时，线宽为2-10MHz范围内返回通量始终保持在峰值的1%以内；通量最优啁啾为0.19MHz/μs，为连续波速率的五分之一，该协同效应可指导高灵敏度中层大气磁强计的设计。
英文摘要
Mesospheric sodium magnetometry with a laser guide star measures the geomagnetic field near 90~km. Its sensitivity hinges on laser linewidth and chirp, yet prior work optimized these two parameters only separately. We use velocity-resolved density-matrix simulations of Larmor-synchronous pulsed Na D$_2$ pumping to scan both parameters jointly. Linewidth and chirp exhibit a synergy: when chirping carries the recoil-mitigation role, the return flux stays within 1\% of its peak across linewidths of 2--10~MHz. The flux-optimal chirp is $0.19~\mathrm{MHz/\upmu s}$, one fifth of the continuous-wave rate; this synergy guides high-sensitivity mesospheric magnetometer design.
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