AI 中文总结
该研究构建中层大气钠梯的十能级速率方程模型，评估四种连续波泵浦方案，得出柱增益指数远低于1等结果，为定向发射相关方案的后续研究提供依据。
AI 中文摘要
从中层大气钠层产生的无镜定向激光，被提出作为克服激光导星荧光各向同性的方法，已在单元级类似系统中得到验证，并在远距离磁测应用中得到演示。钠能级梯上的多个跃迁路径会竞争相同的泵浦光子。我们基于美国国家标准与技术研究院（NIST）的跃迁概率构建了钠梯的十能级速率方程模型，在多普勒平均处理和适用于碰撞稀少的中层大气的速度选择处理下，评估了四种连续波泵浦方案下的所有电偶极谱线。得出三项与设计相关的结果：在实际可达到的连续波辐照度下，柱增益指数仍远低于1，与已发表的可行性估计一致；该分类的价值在于确定哪些谱线、方案和脉冲格式值得进一步研究。
英文摘要
Directed mirrorless lasing from the mesospheric sodium layer has been proposed as a way to overcome the isotropy of laser guide star fluorescence, with demonstrated cell-scale analogues and a demonstrated stand-off magnetometry application. Several transition paths on the Na ladder compete for the same pump photons. We build a ten-level rate-equation model of the ladder from NIST transition probabilities and evaluate every electric-dipole line under four continuous-wave pumping schemes, both in a Doppler-averaged treatment and in a velocity-selective treatment appropriate for the collision-poor mesosphere. Three design-relevant results emerge. At practically accessible continuous-wave irradiances the column-gain exponents remain far below unity, consistent with published feasibility estimates; the value of the classification is to identify which lines, schemes, and pulse formats merit further study.
